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Earnings Per Share - Calculation of EPS (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
Numerator:
Net income	$ 36,595	$ 44,175	$ 45,482	$ 60,953
Denominator:
Weighted-average number of common shares outstanding—basic (in shares)	200,810,323	201,273,767	200,732,639	201,133,321
Weighted-average number of common shares outstanding—diluted (in shares)	201,741,394	201,827,384	201,729,516	201,768,451
Earnings per share:
Basic earnings per share (in dollars per share)	$ 0.18	$ 0.22	$ 0.23	$ 0.30
Diluted earnings per share (in dollars per share)	$ 0.18	$ 0.22	$ 0.23	$ 0.30
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 Stock/SARs/MSUs (in shares)	99,677	0	165,483	81,513
Shares related to unvested PSUs
Denominator:
Unvested Stock/SARs/MSUs (in shares)	831,394	553,617	831,394	553,617

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