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Stockholders' Equity (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Jan. 16, 2015 | Jul. 21, 2014
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Share repurchase program, amount authorized |  |  | $ 100,000 | $ 100,000
Stock Repurchased and Retired During Period, Shares | 43,000 | 3,400,000 |  |
Stock Repurchased and Retired During Period, Value | $ 3,819 | $ 100,048 |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 98,400 |  |  |
Stock Issued During Period, Shares, Acquisitions | 794,700 |  |  |
Stock Repurchased During Period, Value | $ 1,600 |  |  |
Stock Issued During Period, Value, Acquisitions | $ 30,183 |  |  |
sharesreceivedforexercisepriceofoptions | 46,174 |  |  |
payment exercise of stock option | $ 2,200 |  |  |
Additional Paid-in Capital [Member] |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Stock Repurchased and Retired During Period, Value | (1,173) | (31,194) |  |
Stock Repurchased During Period, Value | 400 |  |  |
Stock Issued During Period, Value, Acquisitions | 30,175 |  |  |
Retained Earnings [Member] |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Stock Repurchased and Retired During Period, Value | (2,645) | $ (68,821) |  |
Stock Repurchased During Period, Value | $ 1,200 |  |  |

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