Quarterly Financial Information (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 19,824	$ 18,086	$ 19,401	$ 19,890	$ 20,689	$ 20,211	$ 20,831	$ 20,185	$ 77,201	$ 81,916	$ 80,033
Operating Income (Loss)	4,096	3,000	4,979	5,663	6,620	4,776	7,133	6,395	17,738	24,924	22,015
Income (Loss) from continuing operations, Including Portion Attributable to Noncontrolling Interest	32,209	(3,486)	(1,852)	(1,064)	(106)	(2,186)	(141)	(855)	25,807	(3,288)	(8,031)
Nonoperating Income (Expense)	0	2,805	(1,015)	9,738	(845)	(157)	(15,064)	(284)	11,528	(16,350)	(28,699)
Net Income (Loss) Attributable to Parent	$ 32,163	$ (357)	$ (2,912)	$ 8,582	$ (1,026)	$ (1,983)	$ (15,244)	$ (1,135)	$ 37,476	$ (19,388)	$ (35,640)
Earnings Per Share, Basic and Diluted	$ 1.23	$ (0.01)	$ (0.12)	$ 0.36	$ (0.03)	$ (0.09)	$ (0.64)	$ (0.05)	$ 1.46	$ (0.81)	$ (1.49)
Weighted Average Number of Outstanding Shares Basic and Diluted	25,651,000	26,680,000	24,022,500	23,995,000	23,995,000	23,929,000	23,929,000	23,929,000	25,651,220	23,938,406	23,928,784