Receivables - Narrative (Details)	12 Months Ended
	Dec. 31, 2015 USD ($) payment	Dec. 31, 2014 USD ($)
Receivables [Abstract]
Allowance for doubtful accounts receivable	$ 10,487,000	$ 11,970,000
Number of missed payments before delinquent | payment	3
Typical financing period	12 months
Credit amount requiring additional analysis	$ 250,000
Average period of adjudication	18 months
Installment receivable purchased from DLL	$ 936,000	$ 2,123,000