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Earnings Per Common Share Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Common Share
Net earnings	$ 31,277	$ 12,918	$ 133,055	$ 6,828
Weighted-average shares outstanding	54,487	53,508	54,190	53,455
Effect of dilutive stock awards	1,571	1,404	1,563	946
Weighted-average dilutive shares	56,058	54,912	55,753	54,401
Basic earnings per common share	$ 0.57	$ 0.24	$ 2.46	$ 0.13
Diluted earnings per common share	$ 0.56	$ 0.24	$ 2.39	$ 0.13
Retained Earnings [Member]
Earnings Per Common Share
Net earnings	$ 31,277	$ 12,918	$ 133,055	$ 6,828
Performance-based restricted stock units [Member]
Earnings Per Common Share
Anti-dilutive	260	211	260	211
Option [Member]
Earnings Per Common Share
Anti-dilutive	974	1,417	1,047	1,672

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