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Debt Obligations, net (Narrative) (Details) - USD ($) | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Aug. 31, 2020 | Nov. 30, 2019
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Loss on early extinguishment of debt, net |  |  |  |  | $ 12,038,000 | $ 27,724,000 | $ 10,367,000 |  |
2016 Senior Term Loan | LIBOR |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis point spread on variable interest rate |  |  |  |  | 1.00% |  |  |  |
Secured Debt | 2016 Senior Term Loan |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  | $ 650,000,000.0 |  |  |  |  |
Secured Debt | 2016 Senior Term Loan | Gain (Loss) On Extinguishment Of Debt |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Loss on early extinguishment of debt, net |  |  |  |  |  |  | 2,500,000 |  |
Secured Debt | 2016 Senior Term Loan | LIBOR |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis point spread on variable interest rate |  |  |  | 2.75% | 2.75% |  |  |  |
Secured Debt | 2016 Senior Term Loan | LIBOR | Maximum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis point spread on variable interest rate |  |  |  |  | 1.75% |  |  |  |
Secured Debt | Revolving Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 350,000,000.0 |  |  |  |  |  |
Secured Debt | Revolving Credit Facility | Minimum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Commitment fee percentage |  |  | 0.25% |  |  |  |  |  |
Current borrowing capacity |  |  |  |  | $ 350,000,000.0 |  |  |  |
Secured Debt | Revolving Credit Facility | Maximum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Commitment fee percentage |  |  | 0.45% |  |  |  |  |  |
Secured Debt | Revolving Credit Facility | LIBOR |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis point spread on variable interest rate |  |  |  |  | 2.00% |  |  |  |
Secured Debt | Revolving Credit Facility | LIBOR | Minimum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis point spread on variable interest rate |  |  | 2.00% |  | 1.00% |  |  |  |
Secured Debt | Revolving Credit Facility | LIBOR | Maximum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis point spread on variable interest rate |  |  | 2.50% |  |  |  |  |  |
Secured Debt | Revolving Credit Facility | Base Rate | Minimum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis point spread on variable interest rate |  |  | 1.00% |  |  |  |  |  |
Secured Debt | Revolving Credit Facility | Base Rate | Maximum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis point spread on variable interest rate |  |  | 1.50% |  |  |  |  |  |
Unsecured Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Loss on early extinguishment of debt, net |  |  |  |  | $ 12,000,000.0 | 26,600,000 | $ 1,200,000 |  |
Unsecured Notes | 4.75% senior notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  | $ 675,000,000.0 |  |  |  |  |  | $ 100,000,000.0
Stated interest rate |  |  | 4.75% |  | 4.75% |  |  |  | 4.75%
Percentage of par credit facilities were issued at |  |  |  |  |  |  |  |  | 102.00%
Yield to maturity |  |  |  |  |  |  |  |  | 4.29%
Unsecured Notes | 4.625% senior notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  | $ 400,000,000.0 |  |  |  |  |  |
Stated interest rate |  |  | 4.625% |  |  |  |  |  |
Unsecured Notes | 6.50% senior notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  | $ 275,000,000.0 |  |  |  |  |  |
Stated interest rate |  |  | 6.50% |  |  |  |  |  |
Unsecured Notes | 4.25% senior notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 550,000,000.0 |  |  |  | $ 550,000,000.0 |  |  |
Stated interest rate |  | 4.25% |  |  | 4.25% | 4.25% |  |  |
Unsecured Notes | 6.00% senior notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated interest rate |  | 6.00% |  |  | 6.00% | 6.00% |  |  |
Principal amount called for redemption | $ 110,500,000 | $ 375,000,000.0 |  |  |  |  |  |  |
Unsecured Notes | 5.5% senior notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  | $ 400,000,000.0 |
Stated interest rate |  |  |  |  |  |  |  | 5.50% |
Unsecured Notes | 5.25% senior notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  | $ 400,000,000.0 |
Stated interest rate |  |  |  |  | 5.25% |  |  | 5.25% |

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