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Earnings Per Share - Calculation of EPS (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Numerator:
Net income	$ 21,623	$ 29,937	$ 67,105	$ 90,890
Denominator:
Weighted-average number of common shares outstanding—basic (in shares)	200,834,910	201,297,846	200,767,104	201,188,563
Weighted-average number of common shares outstanding—diluted (in shares)	201,424,400	201,739,604	201,353,649	201,572,206
Earnings per share:
Basic earnings per share (in dollars per share)	$ 0.11	$ 0.15	$ 0.33	$ 0.45
Diluted earnings per share (in dollars per share)	$ 0.11	$ 0.15	$ 0.33	$ 0.45
Stock Appreciation Rights (SARs)
Earnings per share:
Antidilutive securities excluded from calculation (in shares)	20,770	20,770	20,770	20,770
Unvested restricted common stock
Denominator:
Unvested restricted common stock and shares related to unvested PSUs (in shares)	173,557	58,115	170,612	0
Shares related to unvested PSUs
Denominator:
Unvested restricted common stock and shares related to unvested PSUs (in shares)	415,933	383,643	415,933	383,643

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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