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Basis of Presentation and Significant Accounting Policies - Schedule of Amounts Reclassified from Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Revenues $ 438,921 $ 410,011 $ 896,384 $ 838,240
Cost of operations (318,209) (278,356) (645,573) (581,572)
Total before tax 79,227 88,482 164,243 168,860
Other – net 15,106 6,749 23,016 14,235
Provision for Income Taxes (18,493) (27,062) (37,096) (51,654)
Net Income 60,734 61,420 127,147 117,206
Accumulated Other Comprehensive Income (Loss) Component Recognized        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net Income (527) 1 (770) (238)
Accumulated Other Comprehensive Income (Loss) Component Recognized | Realized gain (loss) on derivative financial instruments        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Revenues 7 (9) (4) (13)
Cost of operations (92) 237 28 291
Total before tax (85) 228 24 278
Provision for Income Taxes 21 (58) (9) (71)
Net Income (64) 170 15 207
Accumulated Other Comprehensive Income (Loss) Component Recognized | Amortization of prior service cost on benefit obligations        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Cost of operations (488) (446)    
Other – net     (993) (892)
Provision for Income Taxes 25 157 208 313
Net Income (463) (289) (785) (579)
Accumulated Other Comprehensive Income (Loss) Component Recognized | Realized gain on investments        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Other – net 0 126 0 148
Provision for Income Taxes 0 (6) 0 (14)
Net Income $ 0 $ 120 $ 0 $ 134