Earnings Per Share (EPS) - Schedule of Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Earnings Per Share [Abstract]
Net income	$ 39,951	$ 12,282	$ 68,688	$ 23,859
Weighted average shares of common stock outstanding	69,029,749	70,728,934	68,770,976	70,625,000
Basic EPS (in dollars per share)	$ 0.58	$ 0.17	$ 1.00	$ 0.34
Dilutive effect of stock options and restricted stock units	2,137,000	1,591,000	2,331,000	1,397,000
Weighted average shares of common stock outstanding	71,167,177	72,319,992	71,101,716	72,022,065
Diluted EPS (in dollars per share)	$ 0.56	$ 0.17	$ 0.97	$ 0.33
Common stock equivalents excluded from income per diluted share because of their anti-dilutive effect	279,000	949,000	288,000	1,184,000