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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Statement of Comprehensive Income [Abstract]        
Net income $ 41,825 $ 22,154 $ 78,875 $ 32,174
Defined benefit pension plans        
Actuarial gain, net of tax of $3,383, $-, $3,383 and $-, respectively 9,957 0 9,957 0
Amortization of actuarial loss, net of tax of $90, $158, $298 and $310, respectively 266 252 879 495
Effect of settlements, net of tax of $3,044, $-, $3,044 and $-, respectively 8,959 0 8,959 0
Other comprehensive income, net of tax 19,182 252 19,795 495
Comprehensive income $ 61,007 $ 22,406 $ 98,670 $ 32,669