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Allowance for Doubtful Accounts - Impaired Notes Receivable (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Impaired Notes Receivable:      
Balance beginning of year $ 6,471 $ 10,208 $ 2,892
Additions 0 395 9,124
Deductions 786 4,132 1,808
Balance end of year 5,685 6,471 10,208
Average Outstanding balance 6,078 8,340 6,550
Reserve for Impaired Notes Receivable:      
Balance beginning of year 2,139 3,031 2,019
Additions 280 99 2,489
Deductions 0 991 1,477
Balance end of year $ 2,419 $ 2,139 $ 3,031