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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Net income (loss) $ 13,829 $ (309,445)
Net unrealized gain on derivative instruments qualifying as hedges:    
Reclassification adjustment for loss on derivative instruments included in net income (loss), net of tax of $57 and $60 for the three months ended in 2016 and 2015, respectively 92 99
Postretirement liability adjustment:    
Amortization of postretirement liability (gains) losses included in net periodic benefit cost, net of tax of $(969) and $230 for the three months ended in 2016 and 2015, respectively (1,595) 375
Foreign currency translation adjustment:    
Foreign currency translation adjustment recognized during the period, net of tax of $15 and $(68) for the three months ended in 2016 and 2015, respectively 25 (112)
Reclassification adjustment for loss on foreign currency translation adjustment included in net income, net of tax of $0 and $490 for the three months ended in 2016 and 2015, respectively 0 802
Foreign currency translation adjustment 25 690
Net unrealized gain on available-for-sale investments:    
Net unrealized gain (loss) on available-for-sale investments arising during the period, net of tax of $5 and $(11) for the three months ended in 2016 and 2015, respectively 8 (21)
Reclassification adjustment for loss on available-for-sale investments included in net income, net of tax of $19 and $19 for the three months ended in 2016 and 2015, respectively 36 36
Net unrealized gain on available-for-sale investments 44 15
Other comprehensive income (loss) (1,434) 1,179
Comprehensive income (loss) 12,395 (308,266)
Comprehensive loss attributable to noncontrolling interest (11,040) (3,528)
Comprehensive income (loss) attributable to common stockholders $ 23,435 $ (304,738)