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Stock-Based Incentive Plans (Details) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Apr. 20, 2016 $ / shares shares | Feb. 01, 2016 $ / shares shares | Mar. 31, 2016 USD ($) plan $ / shares shares | Mar. 31, 2015 USD ($) | Dec. 31, 2015 $ / shares shares
Stock-Based Compensation |  |  |  |  |
Number of stock-based incentive plans | plan |  |  | 1 |  |
Number of stock option plans superseded | plan |  |  | 2 |  |
Aggregate Intrinsic Value |  |  |  |  |
Granted (in shares) |  |  | 0 |  | 0
Stock options outstanding and expected to vest |  |  | 0 |  |
Total intrinsic value of options exercised (in dollars) | $ |  |  | $ 200 | $ 1,200 |
Unrecognized compensation cost and vesting period |  |  |  |  |
Unrecognized compensation costs related to unvested share-based compensation arrangements | $ |  |  | $ 16,100 |  |
Weighted-average period for recognition of unrecognized stock-based compensation expense |  |  | 2 years 3 months 18 days |  |
Restricted Stock Units |  |  |  |  |
Stock-Based Compensation |  |  |  |  |
Weighted average granted date fair value (in dollars per share) | $ / shares |  | $ 32.63 |  |  |
Restricted stock unit activity |  |  |  |  |
Outstanding at the beginning of the period (in shares) |  |  | 527,000 |  |
Awarded (in shares) |  | 431,439 | 431,000 |  |
Vested (in shares) |  |  | (324,000) |  |
Forfeited (in shares) |  |  | (4,000) |  |
Outstanding at the end of the period (in shares) |  |  | 630,000 |  | 527,000
Outstanding and expected to vest at end of the period (in shares) |  |  | 615,000 |  |
Weighted-Average Exercise Price |  |  |  |  |
Weighted-average exercise price at beginning of the period (in dollars per share) | $ / shares |  |  | $ 31.56 |  |
Weighted-average exercise price at end of the period (in dollars per share) | $ / shares |  |  | 31.81 |  | $ 31.56
Outstanding and expected to vest at the end of the period (in dollars per share) | $ / shares |  |  | $ 31.81 |  |
Aggregate Intrinsic Value |  |  |  |  |
Outstanding at the end of the period (in dollars) | $ |  |  | $ 24,048 |  |
Outstanding and expected to vest at end of the period (in dollars) | $ |  |  | $ 23,484 |  |
Aggregate Intrinsic Value |  |  |  |  |
Closing price per share (in dollars per share) | $ / shares |  |  | $ 38.17 |  |
Total intrinsic value of awards vested (in dollars) | $ |  |  | $ 10,300 | $ 9,700 |
Restricted Stock Units | Subsequent Event |  |  |  |  |
Stock-Based Compensation |  |  |  |  |
Weighted average granted date fair value (in dollars per share) | $ / shares | $ 38.00 |  |  |  |
Non-Qualified Stock Options |  |  |  |  |
Non-Qualified Stock Options activity |  |  |  |  |
Exercisable at the start of the period (in shares) |  |  | 523,000 |  |
Exercised (in shares) |  |  | (35,000) |  |
Forfeited (in shares) |  |  | (1,000) |  |
Exercisable at the end of the period (in shares) |  |  | 487,000 |  | 523,000
Weighted-Average Exercise Price |  |  |  |  |
Weighted-average exercise price at beginning of the period (in dollars per share) | $ / shares |  |  | $ 29.55 |  |
Weighted-average exercise price at end of the period (in dollars per share) | $ / shares |  |  | $ 29.60 |  | $ 29.55
Weighted-average remaining contractual life |  |  | 1 year 9 months 18 days |  |
Aggregate Intrinsic Value |  |  |  |  |
Outstanding at the end of the period (in dollars) | $ |  |  | $ 4,174 |  |
Non Employee Directors | Restricted Stock Units | Subsequent Event |  |  |  |  |
Restricted stock unit activity |  |  |  |  |
Awarded (in shares) | 1,800 |  |  |  |

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- Definition The intrinsic value of nonvested awards on equity-based plans excluding option plans for nonvested awards outstanding and expected to vest at the end of the period. + References No definition available. + Details
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- Definition The weighted average fair value for nonvested restricted stock units issued during the period on other than stock (or unit) option plans. + References No definition available. + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + 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 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 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 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 number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the 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)(iii) -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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