Stockholders' Equity and Earnings Per Share (Details 2) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net excess tax benefits for restricted stock units	$ 151	$ 4,614
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