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Financial Information (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2017
New Accounting Pronouncement or Change in          
Provision/(benefit) for income taxes $ 28,547 $ 8,897 $ 82,802 $ 8,226  
Accounting Standards Update 201609 [Member] | Minimum [Member]          
New Accounting Pronouncement or Change in          
Provision/(benefit) for income taxes         $ 1,000
Accounting Standards Update 201609 [Member] | Maximum [Member]          
New Accounting Pronouncement or Change in          
Provision/(benefit) for income taxes         $ 2,000