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New Accounting Standards New Accounting Standards (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 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 $ 2,762 $ 0 $ 7,226 $ 0