Investments (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($)
Notes Receivable Long-Term [Member]
Balance at beginning of period
Total gains or (losses) (realized or unrealized)
Purchases	$ 375
Sales
Transfers
Balance at end of period	$ 375
Notes Receivable Current [Member]
Balance at beginning of period	$ 150
Total gains or (losses) (realized or unrealized)
Purchases
Sales
Transfers	$ (150)
Balance at end of period
Investments [Member]
Balance at beginning of period	$ 3,880
Total gains or (losses) (realized or unrealized)	$ 636
Purchases
Sales
Transfers	$ (3,836)
Balance at end of period	$ 680