Redeemable Preferred Stock (Details) (USD $)	12 Months Ended			0 Months Ended			3 Months Ended		6 Months Ended				6 Months Ended				3 Months Ended			6 Months Ended		12 Months Ended			30 Months Ended
	Dec. 31, 1998	Jun. 30, 2013	Jun. 30, 2012	Jun. 14, 2013 Senior Redeemable Preferred Stock [Member]	Aug. 24, 2012 Senior Redeemable Preferred Stock [Member]	May 16, 2012 Senior Redeemable Preferred Stock [Member]	Jun. 30, 2013 Senior Redeemable Preferred Stock [Member]	Jun. 30, 2012 Senior Redeemable Preferred Stock [Member]	Jun. 30, 2013 Senior Redeemable Preferred Stock [Member]	Jun. 30, 2012 Senior Redeemable Preferred Stock [Member]	Dec. 31, 2012 Senior Redeemable Preferred Stock [Member]	May 11, 2012 Senior Redeemable Preferred Stock [Member]	Jun. 30, 2013 Senior Redeemable Preferred Stock [Member] Toxford [Member]	Dec. 31, 2012 Senior Redeemable Preferred Stock [Member] Porter [Member]	Jun. 30, 2013 Senior Redeemable Preferred Stock [Member] Porter And Toxford [Member]	Dec. 31, 2012 Senior Redeemable Preferred Stock [Member] Porter And Toxford [Member]	Jun. 30, 2013 Public Preferred Stock [Member]	Jun. 30, 2012 Public Preferred Stock [Member]	Jun. 30, 2006 Public Preferred Stock [Member]	Jun. 30, 2013 Public Preferred Stock [Member]	Jun. 30, 2012 Public Preferred Stock [Member]	Dec. 31, 2012 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	Jun. 30, 2013 Series A-1 Preferred Stock [Member] Porter And Toxford [Member]	Jun. 30, 2013 Series A-1 Preferred Stock [Member] Senior Redeemable Preferred Stock [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, 2012 Series A-1 Preferred Stock [Member] Senior Redeemable Preferred Stock [Member] Porter And Toxford [Member]	Jun. 30, 2013 Series A-2 Preferred Stock [Member] Porter And Toxford [Member]	Jun. 30, 2013 Series A-2 Preferred Stock [Member] Senior Redeemable Preferred Stock [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, 2012 Series A-2 Preferred Stock [Member] Senior Redeemable Preferred Stock [Member] Porter And Toxford [Member]	Jun. 30, 2013 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		$ 1,981,000	$ 2,053,000														$ 82,500,000			$ 82,500,000		$ 80,600,000
Redeemable preferred stock				2,200,000	2,200,000	2,200,000											114,400,000			114,400,000		112,500,000
Preferred stock issued and outstanding (in shares)																	3,185,586			3,185,586		3,185,586		2,858,723			197	433	433	677			276	607	607	947
Senior Redeemable Preferred Stock [Abstract]
Redeemable preferred stock liquidation value (in dollar per share)																											$ 1,000						$ 1,000
Percentage of redeemable preferred stock redeemed (in hundredths)				54.50%	36.00%	26.70%
Senior redeemable preferred stock maturity date													Aug. 31, 2014
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%
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	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)																															163						228
Percentage of redeemable preferred stock held by related party after redemption (in hundredths)													76.40%	6.30%	82.70%	82.70%										82.70%						82.70%						39.30%
Undeclared unpaid dividends							1,400,000		1,400,000		3,000,000
Accrued dividends reported as interest expenses							33,000	64,000	69,000	142,000							1,000,000	1,000,000		1,900,000	1,900,000
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	$ 0.6
Preferred stock, liquidation preference (in dollars per share)																	$ 10			$ 10
Dividends on preferred stock																	1,000,000	1,000,000		1,900,000	1,900,000
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