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Stockholders' Equity (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Jan. 16, 2015
Shares repurchase and retirement [Line Items] |  |  |  |  |
Allocated Share-based Compensation Expense | $ 5,200 | $ 4,100 | $ 9,200 | $ 7,300 |
Share repurchase program, amount authorized |  |  |  |  | $ 100,000
Stock Repurchased and Retired During Period, Shares |  |  | 43,000 |  |
Stock Repurchased and Retired During Period, Value |  |  | $ 1,600 |  |
Stock Issued During Period, Shares, Acquisitions |  |  | 794,700 |  |
Stock Issued During Period, Value, Acquisitions |  |  | $ 30,200 |  |
Additional Paid-in Capital [Member] |  |  |  |  |
Shares repurchase and retirement [Line Items] |  |  |  |  |
Stock Repurchased and Retired During Period, Value |  |  | 400 |  |
Retained Earnings [Member] |  |  |  |  |
Shares repurchase and retirement [Line Items] |  |  |  |  |
Stock Repurchased and Retired During Period, Value |  |  | $ 1,200 |  |

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