v2.4.0.8
Accumulated Other Comprehensive Loss - Schedule of Reclassifications Out of Accumulated Other Comprehensive Income (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Schedule of Reclassifciations Out of Accumulated Other Comprehensive Income [Line Items]        
Income (loss) before income taxes $ 29,530 $ 28,387 $ 144,515 $ 97,990
Income tax benefit (10,251) (10,348) (49,837) (36,907)
Net income 19,279 18,039 94,678 61,083
Reclassification out of Accumulated Other Comprehensive Income
        
Schedule of Reclassifciations Out of Accumulated Other Comprehensive Income [Line Items]        
Net income (85) [1] (85) [1] (255) [1] (255) [1]
Defined Benefit Plan Items | Reclassification out of Accumulated Other Comprehensive Income
        
Schedule of Reclassifciations Out of Accumulated Other Comprehensive Income [Line Items]        
Amortization of prior-service cost (136) [1],[2] (136) [1],[2] (408) [1],[2] (408) [1],[2]
Income (loss) before income taxes (136) [1] (136) [1] (408) [1] (408) [1]
Income tax benefit 51 [1] 51 [1] 153 [1] 153 [1]
Net income $ (85) [1] $ (85) [1] $ (255) [1] $ (255) [1]
[1] Amounts in parentheses indicate debits to profit/loss
[2] This accumulated other comprehensive income component is included in the computation of net periodic benefit cost (see Note 6. Employee Benefit Plans footnote for additional details).