Redeemable Preferred Stock (Details) (USD $)	0 Months Ended		12 Months Ended			0 Months Ended	12 Months Ended		3 Months Ended	12 Months Ended	30 Months Ended
	Aug. 24, 2012	May 16, 2012	Dec. 31, 2014	Dec. 31, 1991	Dec. 31, 1990 Tranche	Jun. 14, 2013	Dec. 31, 2013	Dec. 31, 2012	Jun. 30, 2006	Dec. 31, 1998	Jun. 30, 1995	Jun. 11, 2013	May 11, 2012	Sep. 27, 2010	Mar. 15, 2011
Class of Stock [Line Items]
Preferred stock dividend rate per annum (in hundredths)			12.00%
Dividends Payable			$ 3,890,000				$ 3,926,000	$ 4,050,000
Senior Redeemable Preferred Stock [Abstract]
Redeemable preferred stock liquidation value (in dollar per share)			$ 1,000
Maximum redemption of redeemable preferred stock												2,000,000	4,000,000
Minimum percentage of discount on redemption of redeemable preferred stock (hundredths)												10.00%	10.00%
Carrying value of senior redeemable preferred stock	2,200,000
Redemption amount of senior redeemable preferred stock	2,000,000	2,000,000				2,000,000
Gain on redemption of senior preferred stock	200,000	200,000
Percentage of discount on redemption of redeemable preferred stock (in hundredths)	10.00%	10.00%				10.00%
Related party preferred stock held after redemption (in shares)	502
12% Cumulative Exchangeable Redeemable Preferred Stock [Abstract]
Number of shares declared as dividend (in shares)				736,863	736,863
Number of annual tranches during the period					5
Accrued paid-in cash dividends											15,100,000
Senior Redeemable Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock dividend rate per annum (in hundredths)			14.125%
Senior Redeemable Preferred Stock [Abstract]
Percentage of redeemable preferred stock redeemed (in hundredths)	36.00%	26.70%				54.50%
Senior redeemable preferred stock maturity date			Feb. 28, 2017
Maximum redemption of redeemable preferred stock													4,000,000	2,500,000
Carrying value of senior redeemable preferred stock		2,200,000				2,200,000
Gain on redemption of senior preferred stock						200,000
Undeclared unpaid dividends			1,500,000				1,400,000
Accrued dividends reported as interest expenses			67,000				103,000	228,000
Senior Redeemable Preferred Stock [Member] | Toxford [Member]
Senior Redeemable Preferred Stock [Abstract]
Percentage of redeemable preferred stock held by related party after redemption (in hundredths)			76.40%
Senior Redeemable Preferred Stock [Member] | Porter [Member]
Senior Redeemable Preferred Stock [Abstract]
Percentage of redeemable preferred stock held by related party after redemption (in hundredths)			6.30%
Senior Redeemable Preferred Stock [Member] | Porter And Toxford [Member]
Senior Redeemable Preferred Stock [Abstract]
Percentage of redeemable preferred stock held by related party after redemption (in hundredths)			82.70%
Public Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock authorized (in shares)					6,000,000
Preferred stock par value (in dollar per share)					0.01
Preferred stock dividend rate per annum (in hundredths)			12.00%	6.00%	6.00%		12.00%
Dividends Payable			88,200,000				84,400,000
Principal and accrued dividends of redeemable preferred stock			120,100,000				116,300,000
Preferred stock issued and outstanding (in shares)			3,185,586		2,858,723		3,185,586
12% Cumulative Exchangeable Redeemable Preferred Stock [Abstract]
Adjusted accrued accretion of public preferred stock									1,500,000
Period during which redeemable preferred stock not callable			12 months
Preferred stock dividend rate per annum (in dollars per share)			$ 0.60
Preferred stock, liquidation preference (in dollars per share)			$ 10
Dividends on preferred stock			3,800,000				3,800,000	3,800,000
Accrued paid-in kind dividends											4,000,000
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
Series A-1 Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock authorized (in shares)			1,250
Preferred stock par value (in dollar per share)			$ 0.01
Series A-1 Preferred Stock [Member] | Porter And Toxford [Member]
Senior Redeemable Preferred Stock [Abstract]
Related party preferred stock held after redemption (in shares)	359					163
Series A-1 Preferred Stock [Member] | Senior Redeemable Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock issued and outstanding (in shares)	433	677	197			197	197
Series A-1 Preferred Stock [Member] | Senior Redeemable Preferred Stock [Member] | Porter [Member]
Senior Redeemable Preferred Stock [Abstract]
Number of redeemable preferred stock acquired by beneficial owner (in shares)															75
Series A-1 Preferred Stock [Member] | Senior Redeemable Preferred Stock [Member] | Porter And Toxford [Member]
Senior Redeemable Preferred Stock [Abstract]
Related party preferred stock held after redemption (in shares)			163
Series A-2 Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock authorized (in shares)			1,750
Preferred stock par value (in dollar per share)			$ 0.01
Series A-2 Preferred Stock [Member] | Porter And Toxford [Member]
Senior Redeemable Preferred Stock [Abstract]
Related party preferred stock held after redemption (in shares)						228
Series A-2 Preferred Stock [Member] | Senior Redeemable Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock issued and outstanding (in shares)	607	947	276			276	276
Series A-2 Preferred Stock [Member] | Senior Redeemable Preferred Stock [Member] | Porter [Member]
Senior Redeemable Preferred Stock [Abstract]
Number of redeemable preferred stock acquired by beneficial owner (in shares)															105
Series A-2 Preferred Stock [Member] | Senior Redeemable Preferred Stock [Member] | Porter And Toxford [Member]
Senior Redeemable Preferred Stock [Abstract]
Related party preferred stock held after redemption (in shares)			228
Class A Common Stock [Member] | Porter [Member]
Senior Redeemable Preferred Stock [Abstract]
Common stock held by related parties (in hundredths)			39.30%
Class A Common Stock [Member] | Porter And Toxford [Member]
Senior Redeemable Preferred Stock [Abstract]
Common stock held by related parties (in hundredths)	39.30%	39.30%