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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Statement of Comprehensive Income [Abstract]        
Net income $ 22,007 $ 32,285 $ 49,854 $ 64,268
Defined benefit pension plans        
Actuarial gain, net of tax of $-, $-, $7,422, and $-, respectively 0 0 11,923 0
Amortization of actuarial (gain) loss, net of tax of $379, ($2), $1,496, and ($6), respectively 608 (3) 2,401 (11)
Effect of settlements, net of tax of $-, $-, $192, and $-, respectively 0 0 309 0
Other comprehensive income (loss), net of tax 608 (3) 14,633 (11)
Comprehensive income $ 22,615 $ 32,282 $ 64,487 $ 64,257