Earnings Per Share (EPS) - Schedule of Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Numerator (basic)
Net income	$ 22,966	$ 14,581	$ 12,282	$ 11,577	$ 14,095	$ 3,097	$ (1,308)	$ 15,811	$ 61,406	$ 31,695	$ 15,497
Less net income allocated to participating securities									0	0	(2,224)
Net income attributable to common stock									$ 61,406	$ 31,695	$ 13,273
Denominator (basic)
Weighted average shares of common stock outstanding									70,159,696	70,228,159	56,160,539
Basic EPS (in dollars per share)	$ 0.34	$ 0.21	$ 0.17	$ 0.16	$ 0.20	$ 0.04	$ (0.02)	$ 0.23	$ 0.88	$ 0.45	$ 0.24
Numerator (diluted)
Net income	$ 22,966	$ 14,581	$ 12,282	$ 11,577	$ 14,095	$ 3,097	$ (1,308)	$ 15,811	$ 61,406	$ 31,695	$ 15,497
Less net income allocated to participating securities									0	0	(2,114)
Net income attributable to common stock									$ 61,406	$ 31,695	$ 13,383
Denominator (diluted)
Weighted average shares of common stock outstanding									70,159,696	70,228,159	56,160,539
Dilutive effect of stock options and restricted stock units									1,812,000	2,390,000	3,406,000
Weighted average shares of common stock outstanding									71,972,486	72,618,069	59,566,773
Diluted EPS (in dollars per share)	$ 0.32	$ 0.20	$ 0.17	$ 0.16	$ 0.20	$ 0.04	$ (0.02)	$ 0.22	$ 0.85	$ 0.44	$ 0.22
Common stock equivalents excluded from diluted weighted average shares of common stock outstanding because of their anti-dilutive effect (in shares)									871,000	1,004,000	526,000