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Recent Accounting Developments Recent Accounting Developments (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Retained Earnings $ (2,246,276)   $ (2,227,214)
Net cash provided by operating activities 54,787 $ 71,339  
Net cash used in financing activities $ (21,965) (7,909)  
Adjustments | ASU 2016-09      
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Cumulative Effect on Retained Earnings, Net of Tax     1,200
Retained Earnings     $ 200
Net cash provided by operating activities   100  
Net cash used in financing activities   $ 100