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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Statement of Comprehensive Income [Abstract]        
Net income $ 20,230 $ 26,418 $ 27,847 $ 31,983
Defined benefit pension plans        
Actuarial gain, net of tax of $7,422, $-, $7,422, and $-, respectively 11,923 0 11,923 0
Amortization of actuarial (gain) loss, net of tax of $504, ($2), $1,117, and ($4), respectively 808 (4) 1,793 (8)
Effect of settlements, net of tax of $-, $-, $192, and $-, respectively 0 0 309 0
Other comprehensive income (loss), net of tax 12,731 (4) 14,025 (8)
Comprehensive income $ 32,961 $ 26,414 $ 41,872 $ 31,975