Derivative Instruments (Narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Derivative Instruments [Abstract]
Increase (decrease) in interest expense from derivatives	$ 525,000	$ 124,000	$ 459,000	$ 70,000
Derivative liabilities, total	1,700,000		1,700,000
Derivative liabilities, noncurrent	329,000		329,000		$ 2,177,000
Derivative liabilities, current	1,399,000		1,399,000
Derivative assets, noncurrent	10,500		10,500
Long-term interest rate cap asset	$ 10,500		$ 10,500