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Schedule II - Valuation and Qualifying Accounts Schedule II Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Allowance for doubtful accounts:      
The roll forward of valuation accounts were as follows:      
Balance at beginning of period $ 733 $ 828 $ 1,637
Charged to costs and expenses 353 715 126
Deductions (543) (810) (935)
Balance at end of period 543 733 828
Valuation allowance for deferred tax assets:      
The roll forward of valuation accounts were as follows:      
Balance at beginning of period 36,675 35,834 34,278
Charged to costs and expenses (159) 841 1,556
Deductions 0 0 0
Balance at end of period $ 36,516 $ 36,675 $ 35,834