Annual report pursuant to Section 13 and 15(d)

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical)

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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement of Stockholders' Equity [Abstract]      
Tax expense on other comprehensive income before reclassifications $ (45,157) $ 20,435 $ (23,791)
Tax benefit from amounts reclassified from accumulated other comprehensive income 2,722 6,373 14,624
Tax (expense on) benefit from other comprehensive income $ (42,435) $ 26,808 $ (9,167)