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Selected Quarterly Financial Data (Unaudited) (Narratives) (Details) - USD ($)
$ 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
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Selected Quarterly Financial Information                      
Income from discontinued operations, net of tax $ 8,300 $ 13,700   $ 34,900 $ 45,000 $ 32,600 $ 24,000 $ 41,400 $ 60,408 $ 142,995 $ 158,790
Long-lived asset impairment 87,400 19,900   $ 8,200 $ 17,900 11,300 9,800 3,800      
Restructuring charges 3,200 $ 300       $ 200 $ 400 $ 4,800 43,884 2,159 0
Goodwill impairment loss $ 3,700               $ 3,738 $ 0 $ 0
April 2015 Contract Operations Acquisition                      
Selected Quarterly Financial Information                      
Income from discontinued operations, net of tax     $ 3,500                
Long-lived asset impairment     9,500                
Restructuring charges     $ 1,200