Fair Value of Financial Instruments (Fair Value, by Balance Sheet Grouping) (Details) (USD $) In Thousands, unless otherwise specified											3 Months Ended																																3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014 Carrying (Reported) Amount, Fair Value Disclosure [Member]	Mar. 31, 2014 Convertible Debt [Member] Carrying (Reported) Amount, Fair Value Disclosure [Member]	Mar. 31, 2014 Trust Preferred Securities Subject to Mandatory Redemption [Member] Carrying (Reported) Amount, Fair Value Disclosure [Member]	Mar. 31, 2014 Other Debt Obligations [Member] Carrying (Reported) Amount, Fair Value Disclosure [Member]	Mar. 31, 2014 Commercial Mortgage Backed Securities [Member]	Dec. 31, 2013 Commercial Mortgage Backed Securities [Member]	Mar. 31, 2014 Commercial Mortgage Backed Securities [Member] Estimate of Fair Value Measurement [Member]	Dec. 31, 2013 Commercial Mortgage Backed Securities [Member] Estimate of Fair Value Measurement [Member]	Mar. 31, 2014 Fair Value, Inputs, Level 3 [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member] Carrying (Reported) Amount, Fair Value Disclosure [Member]	Mar. 31, 2014 Fair Value, Inputs, Level 3 [Member] Estimate of Fair Value Measurement [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member] Estimate of Fair Value Measurement [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member] Convertible Debt [Member] Carrying (Reported) Amount, Fair Value Disclosure [Member]	Mar. 31, 2014 Fair Value, Inputs, Level 3 [Member] Convertible Debt [Member] Estimate of Fair Value Measurement [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member] Convertible Debt [Member] Estimate of Fair Value Measurement [Member]	Mar. 31, 2014 Fair Value, Inputs, Level 3 [Member] Mortgages Notes Payable [Member] Carrying (Reported) Amount, Fair Value Disclosure [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member] Mortgages Notes Payable [Member] Carrying (Reported) Amount, Fair Value Disclosure [Member]	Mar. 31, 2014 Fair Value, Inputs, Level 3 [Member] Mortgages Notes Payable [Member] Estimate of Fair Value Measurement [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member] Mortgages Notes Payable [Member] Estimate of Fair Value Measurement [Member]	Mar. 31, 2014 Fair Value, Inputs, Level 3 [Member] Corporate Bonds [Member] Carrying (Reported) Amount, Fair Value Disclosure [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member] Corporate Bonds [Member] Carrying (Reported) Amount, Fair Value Disclosure [Member]	Mar. 31, 2014 Fair Value, Inputs, Level 3 [Member] Corporate Bonds [Member] Estimate of Fair Value Measurement [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member] Corporate Bonds [Member] Estimate of Fair Value Measurement [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member] Senior Secured Credit Facility [Member] Carrying (Reported) Amount, Fair Value Disclosure [Member]	Mar. 31, 2014 Fair Value, Inputs, Level 3 [Member] Senior Secured Credit Facility [Member] Estimate of Fair Value Measurement [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member] Senior Secured Credit Facility [Member] Estimate of Fair Value Measurement [Member]	Mar. 31, 2014 Fair Value, Inputs, Level 3 [Member] Unsecured Debt [Member] Carrying (Reported) Amount, Fair Value Disclosure [Member] Revolving Credit Facility [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member] Unsecured Debt [Member] Carrying (Reported) Amount, Fair Value Disclosure [Member] Revolving Credit Facility [Member]	Mar. 31, 2014 Fair Value, Inputs, Level 3 [Member] Unsecured Debt [Member] Estimate of Fair Value Measurement [Member] Revolving Credit Facility [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member] Unsecured Debt [Member] Estimate of Fair Value Measurement [Member] Revolving Credit Facility [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member] Trust Preferred Securities Subject to Mandatory Redemption [Member] Carrying (Reported) Amount, Fair Value Disclosure [Member]	Mar. 31, 2014 Fair Value, Inputs, Level 3 [Member] Trust Preferred Securities Subject to Mandatory Redemption [Member] Estimate of Fair Value Measurement [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member] Trust Preferred Securities Subject to Mandatory Redemption [Member] Estimate of Fair Value Measurement [Member]	Mar. 31, 2014 Fair Value, Inputs, Level 3 [Member] Term Loan [Member] Carrying (Reported) Amount, Fair Value Disclosure [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member] Term Loan [Member] Carrying (Reported) Amount, Fair Value Disclosure [Member]	Mar. 31, 2014 Fair Value, Inputs, Level 3 [Member] Term Loan [Member] Estimate of Fair Value Measurement [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member] Term Loan [Member] Estimate of Fair Value Measurement [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member] Other Debt Obligations [Member] Carrying (Reported) Amount, Fair Value Disclosure [Member]	Mar. 31, 2014 Fair Value, Inputs, Level 3 [Member] Other Debt Obligations [Member] Estimate of Fair Value Measurement [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member] Other Debt Obligations [Member] Estimate of Fair Value Measurement [Member]	Mar. 31, 2014 Fair Value, Inputs, Level 3 [Member] Commercial Mortgage Backed Securities [Member]	Mar. 31, 2014 Fair Value, Inputs, Level 3 [Member] Series D Preferred Stock Embedded Derivative [Member]	Mar. 31, 2014 Fair Value, Inputs, Level 3 [Member] Contingent Consideration [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Estimate of Fair Value Measurement [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Estimate of Fair Value Measurement [Member]	Mar. 31, 2014 Contingent Consideration [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member]	Mar. 31, 2014 Contingent Consideration [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member]	Mar. 31, 2014 Contingent Consideration [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member]	Mar. 31, 2014 Contingent Consideration [Member] Fair Value, Measurements, Recurring [Member] Estimate of Fair Value Measurement [Member]	Mar. 31, 2014 Equity Securities [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member]	Dec. 31, 2013 Equity Securities [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member]	Mar. 31, 2014 Equity Securities [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2013 Equity Securities [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member]	Mar. 31, 2014 Equity Securities [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2013 Equity Securities [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member]	Mar. 31, 2014 Equity Securities [Member] Fair Value, Measurements, Recurring [Member] Estimate of Fair Value Measurement [Member]	Dec. 31, 2013 Equity Securities [Member] Fair Value, Measurements, Recurring [Member] Estimate of Fair Value Measurement [Member]	Mar. 31, 2014 Commercial Mortgage Backed Securities [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member]	Dec. 31, 2013 Commercial Mortgage Backed Securities [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member]	Mar. 31, 2014 Commercial Mortgage Backed Securities [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2013 Commercial Mortgage Backed Securities [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member]	Mar. 31, 2014 Commercial Mortgage Backed Securities [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2013 Commercial Mortgage Backed Securities [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member]	Mar. 31, 2014 Commercial Mortgage Backed Securities [Member] Fair Value, Measurements, Recurring [Member] Estimate of Fair Value Measurement [Member]	Dec. 31, 2013 Commercial Mortgage Backed Securities [Member] Fair Value, Measurements, Recurring [Member] Estimate of Fair Value Measurement [Member]	Mar. 31, 2014 Interest Rate Swap [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member]	Dec. 31, 2013 Interest Rate Swap [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member]	Mar. 31, 2014 Interest Rate Swap [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2013 Interest Rate Swap [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member]	Mar. 31, 2014 Interest Rate Swap [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2013 Interest Rate Swap [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member]	Mar. 31, 2014 Interest Rate Swap [Member] Fair Value, Measurements, Recurring [Member] Estimate of Fair Value Measurement [Member]	Dec. 31, 2013 Interest Rate Swap [Member] Fair Value, Measurements, Recurring [Member] Estimate of Fair Value Measurement [Member]	Mar. 31, 2014 Series D Preferred Stock Embedded Derivative [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member]	Dec. 31, 2013 Series D Preferred Stock Embedded Derivative [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member]	Mar. 31, 2014 Series D Preferred Stock Embedded Derivative [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2013 Series D Preferred Stock Embedded Derivative [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member]	Mar. 31, 2014 Series D Preferred Stock Embedded Derivative [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2013 Series D Preferred Stock Embedded Derivative [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member]	Mar. 31, 2014 Series D Preferred Stock Embedded Derivative [Member] Fair Value, Measurements, Recurring [Member] Estimate of Fair Value Measurement [Member]	Dec. 31, 2013 Series D Preferred Stock Embedded Derivative [Member] Fair Value, Measurements, Recurring [Member] Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities, at fair value	$ 213,803	$ 62,067					$ 212,155	$ 60,583	$ 212,200	$ 60,600																																																$ 0	$ 0	$ 1,648	$ 1,484	$ 0	$ 0	$ 1,648	$ 1,484	$ 212,155	$ 60,583	$ 0	$ 0	$ 0	$ 0	$ 212,155	$ 60,583
Derivative assets, at fair value	9,829	9,189																																																																								0	0	9,829	9,189	0	0	9,829	9,189
Total assets																																																																										212,155	60,583	11,477	10,673	0	0	223,632	71,256
Derivative Financial Instruments, Liabilities, Fair Value Disclosure	(35,471)	(18,455)																																																																								0	0	(8,737)	(1,719)	0	0	(8,737)	(1,719)	(26,734)	(16,736)	0	0	0	0	(26,734)	(16,736)
Contingent consideration arrangements																																																						(4,903)	0	0	(4,903)
Total liabilities																																														(31,637)	(16,736)	(8,737)	(1,719)	0	0	(40,374)	(18,455)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value											43,847																																60,583
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Unrealized Gain Included in Other Comprehensive Income, Net											2,948																																2,948
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Changes in Fair Value Included in Net Income, Net											(11,295)																																0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchase/Issuance											147,591																																151,197
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Amortization Included in Net income, Net											(2,573)																																(2,573)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value											180,518																																212,155
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value																																												(16,736)	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Unrealized Gain Included in Other Comprehensive Income, Net																																												0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Changes in Fair Value Included in Net Income, Net																																												(9,998)	(1,297)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value, Purchase/Issuance																																												0	(3,606)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Amortization Included in Net Income, Net																																												0	0
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value																																												(26,734)	(4,903)
Loans held for investment, net	98,185	26,279																98,185	26,279	98,652	26,435
Debt instrument, fair value disclosure			$ 10,318,898	$ 973,737	$ 26,563	$ 68,288						$ 4,348,209	$ 10,349,477	$ 4,353,996	$ 972,490	$ 976,629	$ 976,629	$ 4,234,668	$ 1,301,114	$ 4,265,230	$ 1,305,823	$ 2,545,884	$ 0	$ 2,545,884	$ 0	$ 1,819,800	$ 2,265,800	$ 1,819,800	$ 150,000	$ 150,000	$ 150,000	$ 150,000	$ 26,548	$ 23,485	$ 23,345	$ 53,958	$ 58,979	$ 54,035	$ 59,049	$ 19,278	$ 68,414	$ 19,350