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Schedule II - 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 $ 167 $ 167
Charged to Costs and Expenses 167
Charged to Other Accounts
Deductions 18
Balance at End of Year 149 167 167
Deferred tax asset valuation allowance [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year 19,658 16,946 12,335
Charged to Costs and Expenses
Charged to Other Accounts 1,962 2,712 4,611
Deductions
Balance at End of Year $ 21,620 $ 19,658 $ 16,946