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Quarterly Financial Information (Unaudited) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Jun. 30, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Operating revenues $ 1,062,485 $ 1,280,500 $ 986,215 $ 862,349 $ 1,048,288 $ 1,213,203 $ 952,564 $ 900,761   $ 4,191,549 $ 4,114,816 $ 3,920,171
Operating expenses 1,007,092 1,170,757 940,887 818,680 973,720 1,094,310 890,210 837,153   3,937,416 3,795,393 3,599,469
Operating income 55,393 109,743 45,328 43,669 74,568 118,893 62,354 63,608   254,133 319,423 320,702
Income from continuing operations 32,077 53,400 14,057 15,160 55,051 63,639 29,446 31,027   114,694 179,163 168,691
Income (loss) from discontinued operations, net of tax 6,261 (202,626) (251,415) (324,605) 27,700 38,482 23,881 25,112   $ (772,385) $ 115,175 $ 109,879
Net income (loss) attributable to parent $ 52,534 $ (139,448) $ (229,604) $ (305,917) $ 84,256 $ 103,209 $ 54,106 $ 56,662        
Earnings (loss) per common share - basic [Abstract]                        
Earnings before discontinued operations $ 0.24 $ 0.32 $ 0.11 $ 0.10 $ 0.29 $ 0.33 $ 0.16 $ 0.17   $ 0.77 $ 0.95 $ 0.89
Discontinued operations, net of tax 0.03 (1.04) (1.29) (1.67) 0.14 0.20 0.12 0.13   (3.97) 0.60 0.58
Earnings (loss) per common share - basic $ 0.27 $ (0.72) $ (1.18) $ (1.57) $ 0.43 $ 0.53 $ 0.28 $ 0.30   $ (3.20) $ 1.55 $ 1.47
Weighted average common shares outstanding - basic 195,266 195,151 194,805 194,479 194,136 193,949 192,060 189,820   194,928 192,507 188,855
Earnings per common share - diluted [Abstract]                        
Earnings before discontinued operations $ 0.24 $ 0.32 $ 0.11 $ 0.10 $ 0.29 $ 0.33 $ 0.16 $ 0.16   $ 0.77 $ 0.95 $ 0.89
Discontinued operations, net of tax 0.03 (1.04) (1.29) (1.67) 0.14 0.20 0.12 0.14   (3.97) 0.60 0.58
Earnings (loss) per common share - diluted $ 0.27 $ (0.72) $ (1.18) $ (1.57) $ 0.43 $ 0.53 $ 0.28 $ 0.30   $ (3.20) $ 1.55 $ 1.47
Weighted average common shares outstanding - diluted 195,324 195,169 194,838 194,566 194,219 194,300 192,659 190,432   194,986 192,587 189,693
Additional Information [Abstract]                        
Asset impairment charges   $ 14,100 $ 3,000           $ 14,500      
Withdrawal from multiemployer defined benefit plan [Member] | Operating Engineers Local 800 and WY Contractors Association Pension Plan for WY [Member]                        
Additional Information [Abstract]                        
Multiemployer plan withdrawal obligation       $ 2,400 $ 14,000