Earnings Per Share - Schedule of Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Earnings Per Share [Abstract]
Net income	$ 11,577	$ 15,811
Weighted average shares of common stock outstanding	70,521,000	70,198,000
Basic (in dollars per share)	$ 0.16	$ 0.23
Dilutive effect of stock options and restricted stock units	1,225,000	3,152,000
Weighted average shares of common stock outstanding	71,745,753	73,350,219
Diluted (in dollars per share)	$ 0.16	$ 0.22
Common stock equivalents excluded from income per diluted share because of their anti-dilutive effect	3,396,000	522,000