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Valuation And Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Allowance For Doubtful Accounts [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of year $ 10,300 $ 8,133 $ 4,317
Additions charged to expense 3,766 8,699 4,961
Other 73 (6,532) (1,145)
Balance at end of year $ 14,139 $ 10,300 $ 8,133
Deferred Income Tax Asset Allowance [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of year
Additions charged to expense $ 107,312
Other
Balance at end of year $ 107,312