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Other Assets and Liabilities - Restructuring Accruals (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Mar. 31, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Restructuring Reserve [Roll Forward]          
Restructuring reserve, beginning balance $ 4,159 $ 0   $ 0  
Costs incurred and expensed 4 11,000 $ 0 10,545 $ 0
Costs paid/settled (496)     (3,392)  
Adjustments 0     (3,486)  
Restructuring reserve, ending balance 3,667     3,667  
Termination Benefits          
Restructuring Reserve [Roll Forward]          
Restructuring reserve, beginning balance 3,387 0   0  
Costs incurred and expensed 0 9,000   8,793  
Costs paid/settled (34)     (1,954)  
Adjustments 0 3,000   (3,486)  
Restructuring reserve, ending balance 3,353     3,353  
Contract Termination Costs          
Restructuring Reserve [Roll Forward]          
Restructuring reserve, beginning balance 772 0   0  
Costs incurred and expensed 4 $ 2,000   1,752  
Costs paid/settled (462)     (1,438)  
Adjustments 0     0  
Restructuring reserve, ending balance $ 314     $ 314