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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, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Numerator:
Net income	$ 29,937	$ 24,464	$ 90,890	$ 59,928
Denominator:
Weighted-average number of common shares outstanding—basic (in shares)	201,297,846	200,852,072	201,188,563	200,776,641
Weighted-average number of common shares outstanding—diluted (in shares)	201,739,604	201,167,659	201,572,206	201,124,091
Earnings per share:
Basic earnings per share (in dollars per share)	$ 0.15	$ 0.12	$ 0.45	$ 0.30
Diluted earnings per share (in dollars per share)	$ 0.15	$ 0.12	$ 0.45	$ 0.30
Stock Appreciation Rights (SARs)
Earnings per share:
Antidilutive securities excluded from calculation (in shares)	20,770		20,770
Unvested restricted common stock
Denominator:
Unvested Stock/SARs/MSUs (in shares)	58,115	99,873	0	130,349
Stock Appreciation Rights
Denominator:
Unvested Stock/SARs/MSUs (in shares)	0	0	0	1,387
Shares related to unvested PSUs
Denominator:
Unvested Stock/SARs/MSUs (in shares)	383,643	215,714	383,643	215,714

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