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Earnings Per Share - Calculation of EPS (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Numerator:
Net income	$ 24,772	$ 21,623	$ 36,595	$ 8,887	$ 23,906	$ 29,937	$ 44,175	$ 16,778	$ 91,877	$ 114,796	$ 85,630
Denominator:
Weighted-average number of common shares outstanding—basic									200,784,450	201,079,573	200,796,678
Effect of dilutive securities:
Unvested restricted common stock									188,759	47,468	129,640
Shares related to unvested PSUs									548,259	549,217	533,092
Unexercised stock appreciation rights									0	0	524
Weighted-average number of common shares outstanding—diluted									201,521,468	201,676,258	201,459,934
Basic earnings per share (in dollars per share)	$ 0.12	$ 0.11	$ 0.18	$ 0.04	$ 0.12	$ 0.15	$ 0.22	$ 0.08	$ 0.46	$ 0.57	$ 0.43
Diluted earnings per share (in dollars per share)	$ 0.12	$ 0.11	$ 0.18	$ 0.04	$ 0.12	$ 0.15	$ 0.22	$ 0.08	$ 0.46	$ 0.57	$ 0.43
Stock Appreciation Rights (SARs)
Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount									20,770	20,770

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