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Debt Obligations (Textual) (Details) - USD ($) |  |  |  |  | 9 Months Ended | 12 Months Ended | 15 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 14, 2016 | Oct. 08, 2015 | May 12, 2015 | Sep. 16, 2014 | Oct. 07, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2016 | Apr. 02, 2016 | May 15, 2015
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt, Amount |  |  |  |  |  | $ 0 | $ 0 | $ 376,174,000 |  |  |
Loss on early extinguishment of debt | $ (66,600,000) |  |  |  |  | (66,590,000) | 0 | (7,594,000) |  |  |
Loss on early extinguishment of debt - deferred financing costs |  |  |  |  |  |  |  | 152,000 |  |  |
Recognized hedge activity |  |  |  |  |  | $ 0 | $ 0 | $ (828,000) |  |  |
New Credit Facility [Member] | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt term |  |  | 4 years |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  | $ 600,000,000
Increase in limit |  |  |  |  |  |  |  |  |  |  | 400,000,000
Minimum Credit Spread on a LIBOR Rate Loan |  |  |  |  |  | 0.00% |  |  |  |  |
Maximum Credit Spread on a LIBOR Rate Loan |  |  |  |  |  | 0.55% |  |  |  |  |
Commitment fee percentage |  |  |  |  |  | 0.25% |  |  |  |  |
Minimum fixed charge coverage ratio |  |  |  |  |  | 1.5 |  |  |  |  |
Maximum leverage ratio |  |  |  |  |  | 0.60 |  |  |  |  |
Maximum unsecured indebtedness to unencumbered asset value ratio |  |  |  |  |  | 0.60 |  |  |  |  |
Maximum secured indebtedness to total asset value ratio |  |  |  |  |  | 0.40 |  |  |  |  |
Minimum unencumbered cash flow to interest expense on unsecured debt ratio |  |  |  |  |  | 1.75 |  |  |  |  |
Maximum percent of payments of dividends and distributions |  |  |  |  |  | 95.00% |  |  |  |  |
New Credit Facility [Member] | Revolving Credit Facility | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commitment fee percentage |  |  |  |  |  | 0.125% |  |  |  |  |
New Credit Facility [Member] | Revolving Credit Facility | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commitment fee percentage |  |  |  |  |  | 0.30% |  |  |  |  |
New Credit Facility [Member] | Letter of Credit [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  | 65,000,000
New Credit Facility [Member] | Swing-Loans [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  | $ 60,000,000
New Credit Facility [Member] | LIBOR [Member] | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  |  |  | 1.20% |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  | 1.00% |  |  |  |  |
New Credit Facility [Member] | LIBOR [Member] | Revolving Credit Facility | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  |  |  | 0.875% |  |  |  |  |
New Credit Facility [Member] | LIBOR [Member] | Revolving Credit Facility | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  |  |  | 1.55% |  |  |  |  |
New Credit Facility [Member] | Federal Funds Rate [Member] | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  | 0.50% |  |  |  |  |
Secured Debt [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Weighted Average Interest Rate |  |  |  |  |  | 4.03% | 5.72% | 5.73% | 4.03% |  |
Long-term Debt, Gross |  |  |  |  |  | $ 325,038,000 | $ 562,695,000 |  | $ 325,038,000 |  |
Extinguishment of Debt, Amount | $ 44,400,000 |  |  |  |  |  |  |  |  |  |
Unsecured Debt [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  | 1,703,610,000 | 1,853,529,000 |  | 1,703,610,000 |  |
Recognized hedge activity |  |  |  | $ 800,000 |  |  |  |  |  |  |
Effective interest rate |  |  |  |  |  |  |  |  |  | 6.00% |
Unsecured Debt [Member] | 250.0M 4.10% Guaranteed Notes due 2024 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  | 250,000,000 | 250,000,000 |  | 250,000,000 |  |
Debt instrument, Unamortized discount, Percent of face amount |  |  |  | 99.388% |  |  |  |  |  |  |
Debt instrument, Yield to maturity |  |  |  | 4.175% |  |  |  |  |  |  |
Debt instrument, Yield to maturity spread at time of pricing |  |  |  | 1.70% |  |  |  |  |  |  |
Debt Instrument, Unamortized Discount |  |  |  |  |  | $ 1,200,000 | 1,300,000 |  | $ 1,200,000 |  |
Debt Instrument Maturity Date |  |  |  |  |  | Oct. 01, 2024 |  |  |  |  |
Effective interest rate |  |  |  |  |  | 4.33% |  |  | 4.33% |  |
Unsecured Debt [Member] | $250M 4.55% Guaranteed Notes due 2029 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  | $ 250,000,000 | 250,000,000 |  | $ 250,000,000 |  |
Debt instrument, Unamortized discount, Percent of face amount |  |  |  | 99.191% |  |  |  |  |  |  |
Debt instrument, Yield to maturity |  |  |  | 4.625% |  |  |  |  |  |  |
Debt instrument, Yield to maturity spread at time of pricing |  |  |  | 2.15% |  |  |  |  |  |  |
Debt Instrument, Unamortized Discount |  |  |  |  |  | $ 1,700,000 | 1,800,000 |  | $ 1,700,000 |  |
Debt Instrument Maturity Date |  |  |  |  |  | Oct. 01, 2029 |  |  |  |  |
Effective interest rate |  |  |  |  |  | 4.60% |  |  | 4.60% |  |
Unsecured Debt [Member] | Notes 2024 and 2029 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from Notes Payable |  |  |  | $ 492,900,000 |  |  |  |  |  |  |
Unsecured Debt [Member] | $250.0M 5.400% Guaranteed Notes due 2014 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 5.40% |  |  | 5.40% |  |
Extinguishment of Debt, Amount |  |  |  | 75,100,000 |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  |  |  | 143,500,000 |  |  |  |  |  |  |
Debt Instrument, Redemption, Description |  |  |  |  |  | $1,026.88 per $1,000 |  |  |  |  |
Unsecured Debt [Member] | 7.50% Guaranteed Notes due May 15, 2015 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 7.50% |  |  | 7.50% |  |
Extinguishment of Debt, Amount |  |  |  | 42,700,000 |  |  |  |  |  |  |
Loss on early extinguishment of debt |  |  |  |  |  |  |  | $ 5,000,000 |  |  |
Debt Instrument, Repurchased Face Amount |  |  |  | 114,900,000 |  |  |  |  |  |  |
Debt Instrument, Redemption, Description |  |  |  |  |  | $1,070.24 per $1,000 |  |  |  |  |
Unsecured Debt [Member] | Notes 2015 and 2015 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loss on early extinguishment of debt |  |  |  |  |  |  |  | $ 2,600,000 |  |  |
Unsecured Debt [Member] | Three Year Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  |  |  | $ 150,000,000 |  |  |  |  |  |  |
Debt Instrument Maturity Date |  |  |  | Feb. 01, 2015 |  |  |  |  |  |  |
Unsecured Debt [Member] | Four-Year Term Loan - Swapped to fixed [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  |  |  | $ 100,000,000 |  |  |  |  |  |  |
Unsecured Debt [Member] | Four-Year Term Loan - Variable [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument Maturity Date |  |  |  | Feb. 01, 2016 |  |  |  |  |  |  |
Unsecured Debt [Member] | Three and Four Year Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loss on early extinguishment of debt - deferred financing costs |  |  |  | $ 300,000 |  |  |  |  |  |  |
Unsecured Debt [Member] | Seven Year Term Loan - Swapped to fixed [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  | $ 250,000,000 |  |  | $ 200,000,000 | $ 250,000,000 | $ 250,000,000 |  | $ 250,000,000 |  |
Debt Instrument Maturity Date |  |  |  |  | Feb. 01, 2019 | Oct. 01, 2022 |  |  | Oct. 08, 2022 |  |
Increase in debt |  | 50,000,000 |  |  |  |  |  |  |  |  |
Increase in limit |  | $ 150,000,000 |  |  |  |  |  |  |  |  |
Effective interest rate |  | 3.72% |  |  |  | 3.72% |  |  | 3.72% |  |
Unsecured Debt [Member] | Seven Year Term Loan - Swapped to fixed [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  | 1.80% |  |  |  |  |  |  |  |  |
Unsecured Debt [Member] | New Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument Maturity Date |  |  |  |  |  | May 15, 2019 |  |  |  |  |

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