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Debt Obligations, net (Secured Credit Facility and Term Loan Narrative) (Details)
shares in Millions
 1 Months Ended 2 Months Ended 12 Months Ended
Dec. 31, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Mar. 31, 2015
USD ($)
Mar. 31, 2012
USD ($)
tranche
Feb. 24, 2017
Dec. 31, 2016
USD ($)
shares
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Aug. 31, 2016
USD ($)
Line of Credit Facility [Line Items]                    
Repayment of principal amount             $ 1,437,557,000 $ 432,383,000 $ 1,471,174,000  
Loss on early extinguishment of debt, net             1,619,000 281,000 25,369,000  
Borrowings from debt obligations             716,001,000 549,000,000 1,349,822,000  
Conversion of senior unsecured convertible notes into common stock             $ 9,596,000 0 0  
2016 Senior Secured Credit Facility                    
Line of Credit Facility [Line Items]                    
Debt instrument, face amount   $ 450,000,000.0               $ 500,000,000.0
Percentage of par credit facilities were issued at   99.00%                
Variable interest rate, spread             1.00%      
Multiple of the minimum collateral coverage on outstanding borrowings   1.25                
Minimum amortization payment             0.25%      
Lender fees   $ 4,500,000                
Third party fees recognized   6,200,000                
Third party fees capitalized   4,300,000                
2016 Senior Secured Credit Facility | Other Expense                    
Line of Credit Facility [Line Items]                    
Third party fees recognized   $ 1,900,000                
2016 Senior Secured Credit Facility | London Interbank Offered Rate (LIBOR)                    
Line of Credit Facility [Line Items]                    
Variable interest rate, spread   4.50%         4.50%      
2016 Senior Secured Credit Facility | London Interbank Offered Rate (LIBOR) | Minimum                    
Line of Credit Facility [Line Items]                    
Variable interest rate, spread   1.00%         1.00%      
2016 Senior Secured Credit Facility | London Interbank Offered Rate (LIBOR) | Maximum                    
Line of Credit Facility [Line Items]                    
Variable interest rate, spread             3.50%      
2012 Tranche A-2 Facility                    
Line of Credit Facility [Line Items]                    
Debt instrument, face amount         $ 470,000,000          
Percentage of par credit facilities were issued at         98.50%          
Variable interest rate, spread             5.75%      
Repayment of principal amount             $ 323,200,000      
Loss on early extinguishment of debt, net             $ 1,200,000 $ 300,000 $ 1,500,000  
2012 Tranche A-2 Facility | London Interbank Offered Rate (LIBOR)                    
Line of Credit Facility [Line Items]                    
Variable interest rate, spread             5.75%      
2015 Revolving Credit Facility                    
Line of Credit Facility [Line Items]                    
Debt instrument, face amount $ 250,000,000           $ 250,000,000      
Multiple of the minimum collateral coverage on outstanding borrowings 1.5           1.5      
Repayment of principal amount     $ 5,000,000       $ 245,000,000      
Maximum borrowing capacity $ 250,000,000.0     $ 250,000,000.0     $ 250,000,000.0      
Line of credit facility, interest rate             3.19%      
Converted loan, term             1 year      
2015 Revolving Credit Facility | Minimum                    
Line of Credit Facility [Line Items]                    
Commitment fee percentage       0.375%            
2015 Revolving Credit Facility | Maximum                    
Line of Credit Facility [Line Items]                    
Commitment fee percentage       0.50%            
2015 Revolving Credit Facility | London Interbank Offered Rate (LIBOR)                    
Line of Credit Facility [Line Items]                    
Variable interest rate, spread             2.75%      
2012 Secured Credit Facilities                    
Line of Credit Facility [Line Items]                    
Debt instrument, face amount         $ 880,000,000          
Multiple of the minimum collateral coverage on outstanding borrowings 1.25           1.25      
Number of tranches | tranche         2          
2012 Tranche A-1 Facility                    
Line of Credit Facility [Line Items]                    
Debt instrument, face amount         $ 410,000,000          
Percentage of par credit facilities were issued at         98.00%          
Variable interest rate, spread             4.00%      
2012 Tranche A-1 Facility | London Interbank Offered Rate (LIBOR) | Minimum                    
Line of Credit Facility [Line Items]                    
Variable interest rate, spread         1.25%          
5.875% senior notes                    
Line of Credit Facility [Line Items]                    
Repayment of principal amount     $ 261,400,000              
Stated interest rate 5.875%   5.875%       5.875%      
6.50% senior notes                    
Line of Credit Facility [Line Items]                    
Stated interest rate 6.50%   6.50%       6.50%      
Borrowings from debt obligations     $ 275,000,000              
Unsecured Notes 3.875 Percent Senior Notes Due July 2016                    
Line of Credit Facility [Line Items]                    
Repayment of principal amount     $ 265,000,000              
Stated interest rate 3.875%           3.875%      
3.00% senior convertible notes                    
Line of Credit Facility [Line Items]                    
Repayment of principal amount             $ 200,000,000      
Stated interest rate               3.00%    
Conversion of senior unsecured convertible notes into common stock             $ 9,600,000 $ 9,600,000    
Shares of common stock converted (in shares) | shares             0.8      
1.50% senior convertible notes                    
Line of Credit Facility [Line Items]                    
Repayment of principal amount             $ 200,000,000      
Stated interest rate               1.50%    
Unsecured Debt                    
Line of Credit Facility [Line Items]                    
Loss on early extinguishment of debt, net             400,000      
2016 Secured Term Loan | Secured Debt                    
Line of Credit Facility [Line Items]                    
Debt instrument, face amount $ 170,000,000           $ 170,000,000      
2016 Secured Term Loan | Secured Debt | London Interbank Offered Rate (LIBOR)                    
Line of Credit Facility [Line Items]                    
Variable interest rate, spread 1.50%                  
Subsequent Event | 2016 Senior Secured Credit Facility | London Interbank Offered Rate (LIBOR)                    
Line of Credit Facility [Line Items]                    
Variable interest rate, spread           3.75%        
Subsequent Event | 2016 Senior Secured Credit Facility | London Interbank Offered Rate (LIBOR) | Minimum                    
Line of Credit Facility [Line Items]                    
Variable interest rate, spread           1.00%