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Earnings Per Share - Calculation of EPS (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Numerator:
Net income	$ 8,887	$ 16,778
Denominator:
Weighted-average number of common shares outstanding—basic (in shares)	200,654,092	200,992,875
Weighted-average number of common shares outstanding—diluted (in shares)	201,837,582	201,595,461
Earnings per share:
Basic earnings per share (in dollars per share)	$ 0.04	$ 0.08
Diluted earnings per share (in dollars per share)	$ 0.04	$ 0.08
Stock Appreciation Rights (SARs)
Earnings per share:
Antidilutive securities excluded from calculation (in shares)	20,770
Unvested restricted common stock
Denominator:
Unvested Stock/SARs/MSUs (in shares)	236,081	174,165
Shares related to unvested PSUs
Denominator:
Unvested Stock/SARs/MSUs (in shares)	947,409	428,421

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