Restatement - Balance Sheet (Details) - USD ($)
$ in Thousands
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Dec. 31, 2013
Real estate investments:        
Land and improvements $ 2,666,746 $ 2,614,630    
Buildings and improvements 4,651,097 4,579,166    
Total real estate investments 7,317,843 7,193,796    
Less: accumulated depreciation (779,083) (752,210)    
Real estate investments, net 6,538,760 6,441,586    
Loans receivable, net 107,403 109,425    
Intangible lease assets, net 573,925 590,073    
Real estate assets under direct financing leases, net 52,852 56,564    
Real estate assets held for sale, net 175,794 119,046    
Net investments 7,448,734 7,316,694    
Cash and cash equivalents 108,134 176,181 $ 29,984 $ 66,588
Deferred costs and other assets, net 149,789 185,507    
Goodwill 283,664 285,848    
Total assets 7,990,321 7,964,230    
Liabilities:        
Revolving Credit Facilities, net 181,518 15,114    
Mortgages and notes payable, net 3,456,609 3,629,998    
Convertible Notes, net 681,109 678,190    
Total debt, net 4,319,236 4,323,302    
Intangible lease liabilities, net 204,161 205,968    
Accounts payable, accrued expenses and other liabilities 122,973 123,298    
Total liabilities 4,646,370 4,652,568    
Commitments and contingencies (see Note 8)    
Stockholders’ equity:        
Common stock, $0.01 par value 4,184 4,113    
Capital in excess of par value 4,443,468 4,361,320    
Accumulated deficit (1,102,083) (1,052,688)    
Accumulated other comprehensive loss (1,618) (1,083)    
Treasury stock, at cost 0 0    
Total stockholders’ equity 3,343,951 3,311,662    
Total liabilities and stockholders’ equity 7,990,321 7,964,230    
As Previously Reported        
Real estate investments:        
Land and improvements 2,666,746 2,614,630    
Buildings and improvements 4,651,097 4,579,166    
Total real estate investments 7,317,843 7,193,796    
Less: accumulated depreciation (779,083) (752,210)    
Real estate investments, net 6,538,760 6,441,586    
Loans receivable, net 107,403 109,425    
Intangible lease assets, net 573,925 590,073    
Real estate assets under direct financing leases, net 52,852 56,564    
Real estate assets held for sale, net 177,237 119,912    
Net investments 7,450,177 7,317,560    
Cash and cash equivalents 108,134 176,181 29,984 66,588
Deferred costs and other assets, net 149,789 183,173    
Goodwill 291,421 291,421    
Total assets 7,999,521 7,968,335    
Liabilities:        
Revolving Credit Facilities, net 181,518 12,780    
Mortgages and notes payable, net 3,456,609 3,629,998    
Convertible Notes, net 681,109 678,190    
Total debt, net 4,319,236 4,320,968    
Intangible lease liabilities, net 204,161 205,968    
Accounts payable, accrued expenses and other liabilities 122,973 123,298    
Total liabilities 4,646,370 4,650,234    
Commitments and contingencies (see Note 8)    
Stockholders’ equity:        
Common stock, $0.01 par value 4,189 4,118    
Capital in excess of par value 4,443,468 4,361,320    
Accumulated deficit (1,087,306) (1,041,392)    
Accumulated other comprehensive loss (1,618) (1,083)    
Treasury stock, at cost (5,582) (4,862)    
Total stockholders’ equity 3,353,151 3,318,101    
Total liabilities and stockholders’ equity 7,999,521 7,968,335    
Correction of Allocation of Goodwill to the Disposal of Real Estate Assets | Restatement Adjustments        
Real estate investments:        
Land and improvements 0 0    
Buildings and improvements 0 0    
Total real estate investments 0 0    
Less: accumulated depreciation 0 0    
Real estate investments, net 0 0    
Loans receivable, net 0 0    
Intangible lease assets, net 0 0    
Real estate assets under direct financing leases, net 0 0    
Real estate assets held for sale, net (1,443) (866)    
Net investments (1,443) (866)    
Cash and cash equivalents 0 0 $ 0 $ 0
Deferred costs and other assets, net 0 2,334    
Goodwill (7,757) (5,573)    
Total assets (9,200) (4,105)    
Liabilities:        
Revolving Credit Facilities, net 0 2,334    
Mortgages and notes payable, net 0 0    
Convertible Notes, net 0 0    
Total debt, net 0 2,334    
Intangible lease liabilities, net 0 0    
Accounts payable, accrued expenses and other liabilities 0 0    
Total liabilities 0 2,334    
Commitments and contingencies (see Note 8)    
Stockholders’ equity:        
Common stock, $0.01 par value (5) (5)    
Capital in excess of par value 0 0    
Accumulated deficit (14,777) (11,296)    
Accumulated other comprehensive loss 0 0    
Treasury stock, at cost 5,582 4,862    
Total stockholders’ equity (9,200) (6,439)    
Total liabilities and stockholders’ equity $ (9,200) $ (4,105)