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Stock-Based Incentive Plans (Details) $ / shares in Units, $ in Thousands |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Apr. 21, 2015 shares | Apr. 20, 2015 $ / shares | Feb. 02, 2015 $ / shares shares | Mar. 31, 2015 $ / shares shares | Sep. 30, 2015 USD ($) plan $ / shares shares | Sep. 30, 2014 USD ($) | Dec. 31, 2014 $ / 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Number of stock option plans superseded | plan |  |  |  |  | 2 |  |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) | $ |  |  |  |  | $ 1,600 | $ 700 |
Unrecognized compensation cost and vesting period |  |  |  |  |  |  |
Unrecognized compensation costs related to unvested share-based compensation arrangements | $ |  |  |  |  | $ 17,400 |  |
Weighted-average period for recognition of unrecognized stock-based compensation expense |  |  |  |  | 1 year 11 months 23 days |  |
Restricted Stock Units |  |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |  |
Weighted average granted date fair value (in dollars per share) | $ / shares |  | $ 36.33 | $ 32.64 |  |  |  |
Restricted stock unit activity |  |  |  |  |  |  |
Outstanding at the beginning of the period (in shares) |  |  |  | 504,000 | 504,000 |  |
Awarded (in shares) |  |  | 330,497 |  | 351,000 |  |
Vested (in shares) |  |  |  |  | (317,000) |  |
Forfeited (in shares) |  |  |  |  | (2,000) |  |
Outstanding at the end of the period (in shares) |  |  |  |  | 536,000 |  | 504,000
Outstanding and expected to vest at end of the period (in shares) |  |  |  |  | 524,000 |  |
Weighted-Average Exercise Price |  |  |  |  |  |  |
Weighted-average exercise price at beginning of the period (in dollars per share) | $ / shares |  |  |  | $ 31.67 | $ 31.67 |  |
Weighted-average exercise price at end of the period (in dollars per share) | $ / shares |  |  |  |  | 31.56 |  | $ 31.67
Outstanding and expected to vest at the end of the period (in dollars per share) | $ / shares |  |  |  |  | $ 31.56 |  |
Aggregate Intrinsic Value |  |  |  |  |  |  |
Outstanding at the end of the period (in dollars) | $ |  |  |  |  | $ 17,950 |  |
Outstanding and expected to vest at end of the period (in dollars) | $ |  |  |  |  | $ 17,541 |  |
Aggregate Intrinsic Value |  |  |  |  |  |  |
Closing price per share (in dollars per share) | $ / shares |  |  |  |  | $ 33.49 |  |
Total intrinsic value of awards vested (in dollars) | $ |  |  |  |  | $ 10,100 | $ 9,000 |
Non-Qualified Stock Options |  |  |  |  |  |  |
Non-Qualified Stock Options activity |  |  |  |  |  |  |
Exercisable at the start of the period (in shares) |  |  |  | 855,000 | 855,000 |  |
Exercised (in shares) |  |  |  |  | (238,000) |  |
Forfeited (in shares) |  |  |  |  | (2,000) |  |
Exercisable at the end of the period (in shares) |  |  |  |  | 615,000 |  | 855,000
Weighted-Average Exercise Price |  |  |  |  |  |  |
Weighted-average exercise price at beginning of the period (in dollars per share) | $ / shares |  |  |  | $ 29.48 | $ 29.48 |  |
Weighted-average exercise price at end of the period (in dollars per share) | $ / shares |  |  |  |  | $ 29.51 |  | $ 29.48
Weighted-average remaining contractual life |  |  |  |  | 2 years 3 months 18 days |  |
Aggregate Intrinsic Value |  |  |  |  |  |  |
Outstanding at the end of the period (in dollars) | $ |  |  |  |  | $ 2,447 |  |
Unvested Stock Options |  |  |  |  |  |  |
Number of Shares, Unvested Stock Options |  |  |  |  |  |  |
Vested (in shares) |  |  |  | (99,000) |  |  |
Unvested at the end of the period (in shares) |  |  |  |  | 0 |  |
Weighted-Average Grant-Date Fair Value, Unvested Stock Options |  |  |  |  |  |  |
Vested (in dollars per share) | $ / shares |  |  |  | $ 10.33 |  |  |
Non Employee Directors | Restricted Stock Units |  |  |  |  |  |  |
Restricted stock unit activity |  |  |  |  |  |  |
Awarded (in shares) | 1,950 |  | 8,550 |  |  |  |

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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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