Redeemable Preferred Stock (Details) (USD $)	1 Months Ended	12 Months Ended	30 Months Ended		3 Months Ended		9 Months Ended			9 Months Ended			3 Months Ended			9 Months Ended		12 Months Ended
	Dec. 31, 2009 Tranche	Dec. 31, 1998	Jun. 30, 1995	Sep. 30, 2014	Sep. 30, 2014 Senior Redeemable Preferred Stock [Member]	Sep. 30, 2013 Senior Redeemable Preferred Stock [Member]	Sep. 30, 2014 Senior Redeemable Preferred Stock [Member]	Sep. 30, 2013 Senior Redeemable Preferred Stock [Member]	Dec. 31, 2013 Senior Redeemable Preferred Stock [Member]	Sep. 30, 2014 Senior Redeemable Preferred Stock [Member] Toxford [Member]	Sep. 30, 2014 Senior Redeemable Preferred Stock [Member] Porter [Member]	Sep. 30, 2014 Senior Redeemable Preferred Stock [Member] Porter And Toxford [Member]	Sep. 30, 2014 Public Preferred Stock [Member]	Sep. 30, 2013 Public Preferred Stock [Member]	Jun. 30, 2006 Public Preferred Stock [Member]	Sep. 30, 2014 Public Preferred Stock [Member]	Sep. 30, 2013 Public Preferred Stock [Member]	Dec. 31, 2013 Public Preferred Stock [Member]	Dec. 31, 1991 Public Preferred Stock [Member]	Dec. 31, 1990 Public Preferred Stock [Member]	Sep. 30, 2014 Series A-1 Preferred Stock [Member]	Dec. 31, 2013 Series A-1 Preferred Stock [Member]	Dec. 31, 2013 Series A-1 Preferred Stock [Member] Public Preferred Stock [Member]	Sep. 30, 2014 Series A-2 Preferred Stock [Member]	Dec. 31, 2013 Series A-2 Preferred Stock [Member]	Sep. 30, 2014 Series A-2 Preferred Stock [Member] Senior Redeemable Preferred Stock [Member]	Sep. 30, 2014 Class A Common Stock [Member] Porter And Toxford [Member]
Class of Stock [Line Items]
Preferred stock authorized (in shares)													6,000,000			6,000,000					1,250			1,750
Preferred stock par value (in dollar per share)				$ 0.01									$ 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													$ 87,300,000			$ 87,300,000		$ 84,400,000
Carrying value of redeemable preferred stock													119,100,000			119,100,000		116,300,000
Preferred stock issued and outstanding (in shares)													3,185,586			3,185,586				2,858,723		197	3,185,586	276	276	197
Senior Redeemable Preferred Stock [Abstract]
Redeemable preferred stock liquidation value (in dollar per share)				$ 1,000
Senior redeemable preferred stock maturity date										Feb. 28, 2016
Common stock held by related parties (in hundredths)																											39.30%
Related party preferred stock held after redemption (in shares)																					163			228
Percentage of redeemable preferred stock held by related party after redemption (in hundredths)										76.40%	6.30%	82.70%
Undeclared unpaid dividends					1,500,000		1,500,000		1,400,000
Accrued dividends reported as interest expenses					17,000	17,000	50,000	86,000
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			$ 0.60	$ 0.60
Preferred stock, liquidation preference (in dollars per share)													$ 10			$ 10
Dividends on preferred stock													1,000,000	1,000,000		2,900,000	2,900,000
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