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Stock-Based Compensation Plans (Details) |  |  |  |  | 3 Months Ended | 12 Months Ended
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Feb. 01, 2016 $ / shares shares | Apr. 21, 2015 shares | Apr. 20, 2015 $ / shares | Feb. 06, 2013 | Dec. 31, 2015 USD ($) $ / shares shares | Sep. 30, 2015 $ / shares shares | Jun. 30, 2015 $ / shares | Mar. 31, 2015 $ / shares shares | Dec. 31, 2014 USD ($) $ / shares shares | Sep. 30, 2014 $ / shares | Jun. 30, 2014 $ / shares | Mar. 31, 2014 $ / shares | Dec. 31, 2015 USD ($) plan $ / shares shares | Dec. 31, 2014 USD ($) $ / shares shares | Dec. 31, 2013 USD ($) $ / shares shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of stock-based incentive plans | plan |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |
Number of stock option plans superseded | plan |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |
Stock-Based Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures | shares |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |
Aggregate Intrinsic Value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total intrinsic value of stock options exercised (in dollars) | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,400,000 | $ 800,000 | $ 2,600,000
Weighted-Average Grant-Date Fair Value, Unvested Stock Options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic (in USD per share) |  |  |  |  | $ 0.30 | $ 0.44 | $ 0.44 | $ 0.20 | $ 0.21 | $ 0.42 | $ 0.42 | $ 0.25 | $ 1.39 | $ 1.30 | $ 1.05
Diluted (in USD per share) |  |  |  |  | $ 0.30 | $ 0.44 | $ 0.43 | $ 0.20 | $ 0.21 | $ 0.42 | $ 0.42 | $ 0.25 | $ 1.38 | $ 1.29 | $ 1.05
Unrecognized compensation cost and vesting period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized compensation costs related to unvested stock-based compensation arrangements | $ |  |  |  |  | $ 17,200,000 |  |  |  |  |  |  |  | $ 17,200,000 |  |
Weighted-average period for recognition of unrecognized stock-based compensation expense |  |  |  |  |  |  |  |  |  |  |  |  | 2 years |  |
Other disclosures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense recognized in operating expenses | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 11,212,000 | $ 12,299,000 | $ 12,053,000
Document Fiscal Year Focus |  |  |  |  |  |  |  |  |  |  |  |  | 2015 |  |
Stock Bonus Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other disclosures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued and committed to issue | shares |  |  |  |  |  |  |  |  |  |  |  |  | 9,700.0 | 16,000 | 11,000
Stock-based compensation expense recognized in operating expenses | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 700,000 | $ 900,000 | $ 700,000
Requisite service period for options to vest |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |
Restricted Stock Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock unit activity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at the beginning of the period (in shares) | shares |  |  |  |  |  |  |  | 504,000 |  |  |  |  | 504,000 |  |
Awarded (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  | 351,000 |  |
Vested (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  | (322,000) |  |
Forfeited (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  | (6,000) |  |
Outstanding at the end of the period (in shares) | shares |  |  |  |  | 527,000 |  |  |  | 504,000 |  |  |  | 527,000 | 504,000 |
Outstanding and expected to vest at the end of the period (in shares) | shares |  |  |  |  | 515,000 |  |  |  |  |  |  |  | 515,000 |  |
Weighted-Average Exercise Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at the beginning of the period (in dollars per share) |  |  |  |  |  |  |  | $ 31.67 |  |  |  |  | $ 31.67 |  |
Awarded (in dollars per share) |  |  | $ 36.33 |  |  |  |  |  |  |  |  |  | 31.80 |  |
Vested (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | 31.99 |  |
Forfeited (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | 31.55 |  |
Outstanding at the end of the period (in dollars per share) |  |  |  |  | $ 31.56 |  |  |  | $ 31.67 |  |  |  | 31.56 | $ 31.67 |
Outstanding and expected to vest at the end of the period (in dollars per share) |  |  |  |  | $ 31.56 |  |  |  |  |  |  |  | $ 31.56 |  |
Aggregate Intrinsic Value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at the end of the period (in dollars) | $ |  |  |  |  | $ 17,994,000 |  |  |  | $ 17,423,000 |  |  |  | $ 17,994,000 | $ 17,423,000 |
Outstanding and expected to vest at end of the period (in dollars) | $ |  |  |  |  | $ 17,584,000 |  |  |  |  |  |  |  | $ 17,584,000 |  |
Closing price per share (in dollars per share) |  |  |  |  | $ 34.15 |  |  |  |  |  |  |  | $ 34.15 |  |
Total intrinsic value of awards vested (in dollars) | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,300,000 | $ 9,100,000 | 5,700,000
Weighted-Average Exercise Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at the beginning of the period (in dollars per share) |  |  |  |  |  |  |  | 31.67 |  |  |  |  | $ 31.67 |  |
Forfeited (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | 31.55 |  |
Outstanding at the end of the period (in dollars per share) |  |  |  |  | $ 31.56 |  |  |  | $ 31.67 |  |  |  | $ 31.56 | $ 31.67 |
Aggregate Intrinsic Value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at the end of the period (in dollars) | $ |  |  |  |  | $ 17,994,000 |  |  |  | $ 17,423,000 |  |  |  | $ 17,994,000 | $ 17,423,000 |
Non-Qualified Stock Options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-Average Exercise Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at the beginning of the period (in dollars per share) |  |  |  |  |  |  |  | $ 29.48 |  |  |  |  | $ 29.48 |  |
Forfeited (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | 29.66 |  |
Outstanding at the end of the period (in dollars per share) |  |  |  |  | $ 29.55 |  |  |  | $ 29.48 |  |  |  | $ 29.55 | $ 29.48 |
Aggregate Intrinsic Value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at the end of the period (in dollars) | $ |  |  |  |  | $ 2,406,000 |  |  |  | $ 4,381,000 |  |  |  | $ 2,406,000 | $ 4,381,000 |
Total intrinsic value of awards vested (in dollars) | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 0
Non-Qualified Stock Options activity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at the beginning of the period (in shares) | shares |  |  |  |  |  |  |  | 855,000 |  |  |  |  | 855,000 |  |
Exercised (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  | (330,000) |  |
Forfeited (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  | (2,000) |  |
Outstanding at the end of the period (in shares) | shares |  |  |  |  | 523,000 |  |  |  | 855,000 |  |  |  | 523,000 | 855,000 |
Weighted-Average Exercise Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at the beginning of the period (in dollars per share) |  |  |  |  |  |  |  | $ 29.48 |  |  |  |  | $ 29.48 |  |
Exercised (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | 29.37 |  |
Forfeited (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | 29.66 |  |
Outstanding at the end of the period (in dollars per share) |  |  |  |  | $ 29.55 |  |  |  | $ 29.48 |  |  |  | $ 29.55 | $ 29.48 |
Weighted-Average Remaining Contractual Life |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at the end of the period |  |  |  |  |  |  |  |  |  |  |  |  | 2 years 1 month 6 days | 3 years 1 month 6 days |
Aggregate Intrinsic Value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at the end of the period (in dollars) | $ |  |  |  |  | $ 2,406,000 |  |  |  | $ 4,381,000 |  |  |  | $ 2,406,000 | $ 4,381,000 |
Closing price of share (in dollars per share) |  |  |  |  | $ 34.15 |  |  |  |  |  |  |  | $ 34.15 |  |
Unvested Options [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Shares, Unvested Stock Options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vested (in shares) | shares |  |  |  |  |  |  |  | (99,000) |  |  |  |  |  |  |
Unvested (in shares) | shares |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |
Weighted-Average Grant-Date Fair Value, Unvested Stock Options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vested (in dollars per share) |  |  |  |  |  |  |  | $ 10.33 |  |  |  |  |  |  |
Independent directors | Restricted Stock Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock unit activity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Awarded (in shares) | shares |  | 1,950 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Non-Employee Directors | shares |  | 6 |  |  |  |  |  |  |  |  |  |  |  |  |
Independent directors | Restricted Stock Units | Restrictions lapse (awards vest) on date of award |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  |  | 25.00% |  |  |  |  |  |  |  |  |  |  |
Independent directors | Restricted Stock Units | Restrictions lapse (awards vest) on first, second and third anniversaries of the date of the award |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  |  | 25.00% |  |  |  |  |  |  |  |  |  |  |
Restrictions on awards to certain officers | Restricted Stock Units | Restrictions lapse (awards vest) on the fourth anniversary of the date of the award |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  |  | 25.00% |  |  |  |  |  |  |  |  |  |  |
Restrictions on awards to certain officers | Restricted Stock Units | Restrictions lapse (awards vest) on the third anniversary of the date of the award |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |
Subsequent event | Restricted Stock Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock unit activity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Awarded (in shares) | shares | 431,439 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent event | Independent directors | Restricted Stock Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-Average Exercise Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Awarded (in dollars per share) | $ 32.63 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which option holders acquired shares when converting their stock options into shares. + References No definition available. + Details
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- Definition Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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