Fair Value of Financial Instruments Narrative (Details) (USD $)	0 Months Ended	1 Months Ended			6 Months Ended
	Apr. 25, 2013	Mar. 31, 2012	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2013 Convertible Debt Securities [Member]	Jun. 30, 2013 Credit Facility Receivable [Member]
Fair Value of Financial Instruments (Textual) [Abstract]
Carrying value of long-term debt			$ 183,707,000	$ 105,328,000
Fair value of long-term debt			173,200,000	105,300,000
Fair Value of Financial Instruments (Additional Textual) [Abstract]
Principal amount of convertible note					6,500,000
Interest rate on convertible note					4.00%
Number of common shares note receivable converted into	1,533,858
Post-conversion equity ownership percentage in investee	16.00%
Note and accrued interest, fair value	6,900,000
Note and accrued interest, carrying value	7,000,000
Realized loss on convertible note prior to conversion	(100,000)
Credit facility to investee		4,000,000
Amount drawn on credit facility by investee					$ 4,000,000	$ 4,000,000