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Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended								12 Months Ended
	May 31, 2017	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Earnings Per Share [Abstract]
Net income		$ 9,357	$ 15,797	$ 12,726	$ 929	$ 151,758	$ 20,988	$ 24,809	$ 26,888	$ 38,809	$ 224,443	$ 176,370
Basic weighted-average common shares outstanding	71,600									70,318	71,661	71,588
Effect of dilutive stock-based compensation awards										229	66
Diluted weighted-average common shares outstanding										70,547	71,727	71,588
Earnings per share, basic		$ 0.14	$ 0.23	$ 0.18	$ 0.01	$ 2.12	$ 0.29	$ 0.35	$ 0.38	$ 0.55	$ 3.13	$ 2.46
Earnings per share, diluted		$ 0.14	$ 0.23	$ 0.18	$ 0.01	$ 2.11	$ 0.29	$ 0.35	$ 0.38	$ 0.55	$ 3.13	$ 2.46

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