Other Operating Revenues and Expenses (Details) (USD $)	1 Months Ended		3 Months Ended		9 Months Ended
	Jul. 31, 2014	Mar. 31, 2014	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Other operating revenues:
Gain on sales of assets			$ 1,080,000	$ 1,971,000	$ 11,289,000	$ 2,738,000
Marketing revenue			1,774,000	0	3,351,000	1,795,000
Total other operating revenues			2,854,000	1,971,000	14,640,000	4,533,000
Other operating expenses:
Loss on sales of assets			1,480,000	39,000	2,210,000	1,084,000
Marketing expense			0	302,000	0	658,000
Impairment of inventory			0	122,000	10,000	127,000
Total other operating expenses			1,480,000	463,000	2,220,000	1,869,000
Gain (loss) on sales of assets	$ 800,000	$ (800,000)