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Valuation And Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Allowance For Doubtful Accounts [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of year $ 14,139 $ 10,300 $ 8,133
Additions charged to expense 1,552 3,766 8,699
Other   73  
Other, deductions (2,771)   (6,532)
Balance at end of year 12,920 14,139 10,300
Deferred Income Tax Asset Allowance [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of year 107,312
Additions charged to expense 20,450 107,312
Other, deductions (17,849)
Balance at end of year $ 109,913 $ 107,312