Redeemable Preferred Stock (Details) (USD $)	12 Months Ended				0 Months Ended		12 Months Ended						12 Months Ended			3 Months Ended	12 Months Ended				30 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 1998	Aug. 24, 2012 Senior Redeemable Preferred Stock [Member]	May 16, 2012 Senior Redeemable Preferred Stock [Member]	Dec. 31, 2012 Senior Redeemable Preferred Stock [Member]	Dec. 31, 2011 Senior Redeemable Preferred Stock [Member]	Dec. 31, 2010 Senior Redeemable Preferred Stock [Member]	May 11, 2012 Senior Redeemable Preferred Stock [Member]	Apr. 08, 2011 Senior Redeemable Preferred Stock [Member]	Sep. 27, 2010 Senior Redeemable Preferred Stock [Member]	Dec. 31, 2012 Senior Redeemable Preferred Stock [Member] Toxford [Member]	Dec. 31, 2012 Senior Redeemable Preferred Stock [Member] Porter [Member]	Dec. 31, 2012 Senior Redeemable Preferred Stock [Member] Porter And Toxford [Member]	Jun. 30, 2006 Public Preferred Stock [Member]	Dec. 31, 2012 Public Preferred Stock [Member]	Dec. 31, 2011 Public Preferred Stock [Member]	Dec. 31, 1991 Public Preferred Stock [Member]	Dec. 31, 1990 Public Preferred Stock [Member]	Jun. 30, 1995 Public Preferred Stock [Member] Tranche	Aug. 24, 2012 Series A-1 Preferred Stock [Member] Porter And Toxford [Member]	Apr. 08, 2011 Series A-1 Preferred Stock [Member] Porter And Toxford [Member]	Dec. 31, 2012 Series A-1 Preferred Stock [Member] Senior Redeemable Preferred Stock [Member]	Aug. 24, 2012 Series A-1 Preferred Stock [Member] Senior Redeemable Preferred Stock [Member]	May 16, 2012 Series A-1 Preferred Stock [Member] Senior Redeemable Preferred Stock [Member]	Dec. 31, 2011 Series A-1 Preferred Stock [Member] Senior Redeemable Preferred Stock [Member]	Apr. 08, 2011 Series A-1 Preferred Stock [Member] Senior Redeemable Preferred Stock [Member]	Mar. 15, 2011 Series A-1 Preferred Stock [Member] Senior Redeemable Preferred Stock [Member] Porter [Member]	Dec. 31, 2012 Series A-1 Preferred Stock [Member] Senior Redeemable Preferred Stock [Member] Porter And Toxford [Member]	Aug. 24, 2012 Series A-2 Preferred Stock [Member] Porter And Toxford [Member]	Apr. 08, 2011 Series A-2 Preferred Stock [Member] Porter And Toxford [Member]	Dec. 31, 2012 Series A-2 Preferred Stock [Member] Senior Redeemable Preferred Stock [Member]	Aug. 24, 2012 Series A-2 Preferred Stock [Member] Senior Redeemable Preferred Stock [Member]	May 16, 2012 Series A-2 Preferred Stock [Member] Senior Redeemable Preferred Stock [Member]	Dec. 31, 2011 Series A-2 Preferred Stock [Member] Senior Redeemable Preferred Stock [Member]	Apr. 08, 2011 Series A-2 Preferred Stock [Member] Senior Redeemable Preferred Stock [Member]	Mar. 15, 2011 Series A-2 Preferred Stock [Member] Senior Redeemable Preferred Stock [Member] Porter [Member]	Dec. 31, 2012 Series A-2 Preferred Stock [Member] Senior Redeemable Preferred Stock [Member] Porter And Toxford [Member]	Mar. 15, 2011 Class A Common Stock [Member] Porter [Member]	Aug. 24, 2012 Class A Common Stock [Member] Porter And Toxford [Member]	May 16, 2012 Class A Common Stock [Member] Porter And Toxford [Member]	Apr. 08, 2011 Class A Common Stock [Member] Porter And Toxford [Member]
Class of Stock [Line Items]
Preferred stock authorized (in shares)																	6,000,000							1,250									1,750
Preferred stock par value (in dollar per share)																	$ 0.01							$ 0.01									$ 0.01
Preferred stock dividend rate per annum (in hundredths)							14.125%										12.00%	12.00%	6.00%	6.00%
Dividends Payable	$ 4,050,000	$ 4,159,000	$ 4,241,000														$ 80,600,000	$ 76,800,000
Redeemable preferred stock					2,200,000	2,200,000					2,300,000	522,000					112,500,000	108,600,000
Preferred stock issued and outstanding (in shares)																	3,185,586	3,185,586		2,858,723				433	433	677	923	923					607	607	947	1,292	1,292
Senior Redeemable Preferred Stock [Abstract]
Redeemable preferred stock liquidation value (in dollar per share)							$ 1,000
Percentage of redeemable preferred stock redeemed (in hundredths)					36.00%	26.70%					22.30%	4.90%
Senior redeemable preferred stock maturity date													Aug. 31, 2014
Maximum redemption of redeemable preferred stock										4,000,000		2,500,000
Minimum percentage of discount on redemption of redeemable preferred stock (hundredths)										10.00%		10.00%
Redemption amount of senior redeemable preferred stock					2,000,000	2,000,000					2,100,000	430,000
Gain on redemption of senior preferred stock					200,000	200,000		200,000	92,000
Percentage of discount on redemption of redeemable preferred stock (in hundredths)					10.00%	10.00%					10.00%	17.50%
Common stock held by related parties (in hundredths)																																								44.00%	44.00%	44.00%	44.00%
Number of redeemable preferred stock acquired by beneficial owner (in shares)																													75									105
Related party preferred stock held after redemption (in shares)																						359	763							359	502	1,069							502
Percentage of redeemable preferred stock held by related party after redemption (in hundredths)													76.40%	6.30%	82.70%
Undeclared unpaid dividends							3,000,000	6,000,000
Accrued dividends reported as interest expenses							228,000	337,000	418,000								3,800,000
12% Cumulative Exchangeable Redeemable Preferred Stock [Abstract]
Adjusted accrued accretion of public preferred stock																1,500,000
Number of shares declared as dividend (in shares)																			736,863	736,863
Number of annual tranches during the period																					5
Period during which redeemable preferred stock not callable																	12 months
Preferred stock dividend rate per annum (in dollars per share)																	$ 1.20		$ 0.6	$ 0.6
Preferred stock, liquidation preference (in dollars per share)																	$ 10
Dividends on preferred stock	4,100,000	4,200,000	4,200,000
Accrued paid-in kind dividends																					4,000,000
Accrued paid-in cash dividends																					15,100,000
Redemption of public preferred stock (in shares)				410,000
Reduced amount of Paid in kind dividends due to redemption of public preferred stock																					3,500,000
Adjusted amount of accrued cash dividends due to redemption of public preferred stock																					9,900,000
Revised accrued dividends to reflect change from Pik dividends to cash dividends																					$ 13,400,000