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Other Assets and Liabilities - Restructuring Accruals (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Mar. 31, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Restructuring Reserve [Roll Forward]          
Restructuring reserve, beginning balance $ 5,245 $ 0   $ 0  
Costs incurred and expensed (118) 11,000 $ 0 10,541 $ 0
Costs paid/settled (968)     (2,896)  
Adjustments 0     (3,486)  
Restructuring reserve, ending balance 4,159 5,245   4,159  
Termination Benefits          
Restructuring Reserve [Roll Forward]          
Restructuring reserve, beginning balance 3,926 0   0  
Costs incurred and expensed 55 9,000   8,793  
Costs paid/settled (594)     (1,920)  
Adjustments 0 (3,000)   (3,486)  
Restructuring reserve, ending balance 3,387 3,926   3,387  
Contract Termination Costs          
Restructuring Reserve [Roll Forward]          
Restructuring reserve, beginning balance 1,319 0   0  
Costs incurred and expensed (173) 2,000   1,748  
Costs paid/settled (374)     (976)  
Adjustments 0     0  
Restructuring reserve, ending balance $ 772 $ 1,319   $ 772