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New Accounting Standards New Accounting Standards (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Accounting Changes and Error Corrections [Abstract]    
Income Tax Effects Allocated Directly to Equity, Cumulative Effect of Change in Accounting Principle $ 17,700  
Effective Income Tax Rate Reconciliation, Equity in Earnings (Losses) of Unconsolidated Subsidiary, Amount $ (1,856) $ 0