Receivables (Narrative) (Details) (USD $)	9 Months Ended
	Sep. 30, 2014 payment	Dec. 31, 2013
Receivables [Abstract]
Allowance for doubtful accounts receivable	$ 14,090,000	$ 17,715,000
Number of missed payments before delinquent	3
Typical financing period	12 months
Credit amount requiring additional analysis	250,000
Average period of adjudication	18 months
Installment receivable purchased from DLL	$ 1,918,000