Segment Disclosure (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended																12 Months Ended
	Dec. 31, 2014		Sep. 30, 2014		Jun. 30, 2014		Mar. 31, 2014		Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Revenue Information by operating segment [Abstract]
Revenues	$ 9,647	[1]	$ 9,178	[1]	$ 8,981	[1]	$ 10,924	[1]	$ 12,518	[1]	$ 10,177	[1]	$ 11,398	[1]	$ 11,764	[1]	$ 38,730	[1]	$ 45,857	[1]	$ 134,017	[1]

[1] 1 Includes related party amounts of $2,993 in 2014, $7,363 in 2013, and $6,458 in 2012. See Note 14 for additional information on related party transactions.