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Stockholders' Equity and Earnings Per Share (Details 2) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Net excess tax benefits for restricted stock units | $ 49 | $ 4,463
Accounting Standards Update 2016-09 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Impact on basic earnings per share, ASU 2016-09 (in dollars per share) | $ 0 | $ 0.03
Impact on diluted earnings per share, ASU 2016-09 (in dollars per share) | $ 0 | $ 0.03

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