Equity Compensation, Employment Agreements and Other Benefit Plans (Details) (USD $)	3 Months Ended		6 Months Ended			1 Months Ended	3 Months Ended		6 Months Ended		3 Months Ended	6 Months Ended		3 Months Ended		6 Months Ended			3 Months Ended		6 Months Ended				6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Apr. 30, 2014 DER	Jun. 30, 2014 DER	Jun. 30, 2013 DER	Jun. 30, 2014 DER	Jun. 30, 2013 DER	Jun. 30, 2013 Stock options	Jun. 30, 2014 Stock options	Jun. 30, 2013 Stock options	Jun. 30, 2014 Restricted common stock	Jun. 30, 2013 Restricted common stock	Jun. 30, 2014 Restricted common stock	Jun. 30, 2013 Restricted common stock	Dec. 31, 2013 Restricted common stock	Jun. 30, 2014 Restricted Stock Units	Jun. 30, 2013 Restricted Stock Units	Jun. 30, 2014 Restricted Stock Units		Jun. 30, 2013 Restricted Stock Units	Dec. 31, 2013 Restricted Stock Units	Jun. 30, 2014 Restricted Stock Units Chief Executive Officer	Jun. 30, 2014 2010 Equity Compensation Plan
Share based compensation
Maximum shares authorized for grant	13,500,000.0		13,500,000.0
Shares available for grant	9,200,000		9,200,000
Maximum number of common shares that can be granted to participant in any one year																										1,500,000
Period during which a participant can be awarded the maximum number of shares allowable under the Plan																										1 year
Maximum percentage of common shares that can be owned or deemed to be owned by a participant																										9.80%
Payments attributable to DERs							$ 193,000	$ 922,000	$ 362,000	$ 1,200,000
Dividends declared per share of common stock, special dividend (in dollars per share)						$ 0.50
Share-based awards outstanding (in shares)							1,251,233		1,251,233
DERs outstanding that are attached to common stock options (in shares)							1,250		1,250
DERS outstanding that are awarded in connection with or attached to RSU (in shares)							1,249,983		1,249,983
Average forfeiture rate on DERs outstanding									0.00%
Weighted average period over which DERs are scheduled to elapse									2 years 1 month 6 days
Period to determine market value of the common stock to qualify as an incentive stock option for tax purposes												1 year
Maximum grant date market value of the common stock to be received upon exercise of options in one calendar year												100,000
Exercise price of an ISO relative to fair market value on the grant date, minimum (as a percent)												100.00%
Exercise price of an ISO granted to a 10% stockholder relative to fair market value on the grant date, minimum (as a percent)												110.00%
Percentage of stockholders to whom 110% of ISO is granted												10.00%
Maximum period for exercise of stock options												10 years
Stock options exercised (in shares)											20,000	0	20,000
Stock options cancelled (in shares)											0	0	0
Stock options, outstanding (in shares)												5,000
Options exercisable at end of period (in dollars per share)												$ 8.40
Aggregate intrinsic value of total stock options Outstanding												0
Granted (in shares)														63,060	16,412	63,060	28,743		16,860	40,324	627,481		40,324
Forfeitures (in shares)																					97,164
Unrecognized compensation cost														2,500,000		2,500,000		3,300,000	4,000,000		4,000,000			1,600,000
Accrued dividends payable	74,104,000	80,440,000	74,104,000	80,440,000	73,643,000									385,000		385,000		413,000
Period for recognizing unrecognized compensation cost																2 years 4 months 10 days					2 years 2 months 16 days
Weighted average forfeiture rate of unvested RSUs (as a percent)																					0.00%
Expense recognized for equity-based compensation instruments	$ 1,602,000	$ 1,301,000	$ 3,086,000	$ 2,186,000			$ 37,000	$ 51,000	$ 74,000	$ 102,000				$ 882,000	$ 591,000	$ 1,249,000	$ 1,135,000		$ 683,000	$ 659,000	$ 1,763,000	[1]	$ 949,000		$ 500,000

[1] RSU expense for the six months ended June 30, 2014 includes approximately $500,000 for a one-time grant to the Company’s chief executive officer.