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Stock-Based Incentive Plans (Details) (USD $) | 0 Months Ended | 6 Months Ended
--- | --- | ---
Feb. 03, 2014 | Jun. 30, 2014 | Jun. 30, 2013
Stock-Based Compensation |  |  |
Number of stock-based incentive plans |  | 1 |
Number of stock option plans superseded |  | 2 |
Aggregate Intrinsic Value |  |  |
Total intrinsic value of options exercised (in dollars) |  | $ 500,000 | $ 200,000
Granted (in shares) |  | 0 | 0
Unrecognized compensation cost and vesting period |  |  |
Unrecognized compensation costs related to unvested share-based compensation arrangements |  | 22,300,000 |
Weighted-average period for recognition of unrecognized stock-based compensation expense |  | 1 year 10 months 24 days |
Restricted Stock Units |  |  |
Stock-Based Compensation |  |  |
Awarded (in dollars per share) | $ 30.98 |  |
Restricted stock unit activity |  |  |
Outstanding at the beginning of the period (in shares) |  | 448,000 |
Awarded (in shares) | 342,950 | 343,000 |
Vested (in shares) |  | (249,000) |
Forfeited (in shares) |  | (1,000) |
Outstanding at the end of the period (in shares) |  | 541,000 |
Outstanding and expected to vest at the end of the period (in shares) |  | 528,000 |
Weighted-Average Exercise Price |  |  |
Outstanding and expected to vest at the end of the period (in dollars per share) |  | $ 31.69 |
Aggregate Intrinsic Value |  |  |
Closing price per share (in dollars per share) |  | $ 36.36 |
Total intrinsic value of awards vested (in dollars) |  | 8,000,000 | 5,500,000
Weighted-Average Exercise Price |  |  |
Outstanding at the beginning of the period (in dollars per share) |  | $ 32.48 |
Outstanding at the end of the period (in dollars per share) |  | $ 31.68 |
Aggregate Intrinsic Value |  |  |
Outstanding at the end of the period (in dollars) |  | 19,669,000 |
Outstanding and expected to vest at end of the period (in dollars) |  | 16,745,000 |
Non-Qualified Stock Options |  |  |
Weighted-Average Remaining Contractual Life |  |  |
Outstanding and expected to vest at end of the period |  | 3 years 6 months |
Exercisable at end of the period |  | 3 years 6 months |
Non-Qualified Stock Options activity |  |  |
Outstanding at the beginning of the period (in shares) |  | 1,021,000 |
Exercised (in shares) |  | (92,000) |
Forfeited (in shares) |  | (5,000) |
Outstanding at the end of the period (in shares) |  | 924,000 |
Outstanding and expected to vest at the end of the period (in shares) |  | 916,000 |
Exercisable at the end of the period (in shares) |  | 669,000 |
Weighted-Average Exercise Price |  |  |
Outstanding at the beginning of the period (in dollars per share) |  | $ 29.35 |
Outstanding at the end of the period (in dollars per share) |  | $ 29.40 |
Outstanding and expected to vest at end of the period (in dollars per share) |  | $ 29.40 |
Exercisable at end of the period (in dollars per share) |  | $ 29.30 |
Aggregate Intrinsic Value |  |  |
Outstanding at the end of the period (in dollars) |  | 6,436,000 |
Outstanding and expected to vest at end of the period (in dollars) |  | 6,378,000 |
Exercisable at end of the period (in dollars) |  | $ 4,726,000 |
Unvested Stock Options |  |  |
Number of Shares, Unvested Stock Options |  |  |
Unvested at the beginning of the period (in shares) |  | 448,000 |
Vested (in shares) |  | (193,000) |
Unvested at the end of the period (in shares) |  | 255,000 |
Weighted-Average Grant-Date Fair Value, Unvested Stock Options |  |  |
Unvested at the beginning of the period (in dollars per share) |  | $ 10.31 |
Vested (in dollars per share) |  | $ 10.29 |
Unvested at the end of the period (in dollars per share) |  | $ 10.33 |
Non Employee Directors | Restricted Stock Units |  |  |
Restricted stock unit activity |  |  |
Awarded (in shares) | 9,975 |  |

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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 Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + 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 + Details
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