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Debt Obligations (Textual) (Details) - USD ($) |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
May. 12, 2015 | Sep. 16, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | May. 15, 2015
Debt Instrument [Line Items] |  |  |  |  |  |
Extinguishment of Debt, Amount |  |  | $ 0 | $ 376,174,000 | $ 29,250,000 |
Loss on early extinguishment of debt |  |  | 0 | (7,594,000) | (2,119,000) |
Write off of Deferred Debt Issuance Cost |  |  |  | 152,000 | 40,000 |
Recognized hedge activity |  |  | $ 0 | $ (828,000) | $ 0 |
Financial and operating covenant description |  |  | The restriction on dividends permits the Company to pay dividends to the greater of (i) an amount required for the Company to retain its qualification as a REIT and (ii) 95% of its funds from operations. The term loan includes financial covenants that require the Company to maintain an interest coverage ratio, a fixed charge coverage ratio and an unencumbered cash flow ratio above specified levels; to maintain a minimum net worth above an amount determined on a specified formula; and to maintain a leverage ratio and a secured debt ratio below certain maximum levels. |  |  |
Percentage of fund from operations |  |  | 95.00% |  |  |
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] | Revolving Credit Facility | LIBOR [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate |  |  | 1.20% |  |  |
Basis spread on variable rate |  |  | 1.00% |  |  |
New Credit Facility [Member] | Revolving Credit Facility | LIBOR [Member] | Minimum [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate |  |  | 0.875% |  |  |
New Credit Facility [Member] | Revolving Credit Facility | LIBOR [Member] | Maximum [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate |  |  | 1.55% |  |  |
New Credit Facility [Member] | Revolving Credit Facility | Federal Funds Rate [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate |  |  | 0.50% |  |  |
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
Secured Debt [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term Debt, Weighted Average Interest Rate |  |  | 5.72% | 5.72% | 5.73% |
Long-term Debt, Gross |  |  | $ 562,695,000 | $ 655,934,000 |  |
Unsecured Debt [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term Debt, Gross |  |  | 1,853,529,000 | 1,803,529,000 |  |
Recognized hedge activity |  | $ 800,000 |  |  |  |
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 |  |
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 |  |  | $ 1,300,000 | 1,500,000 |  |
Debt Instrument Maturity Date |  |  | Oct. 01, 2024 |  |  |
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 |  |
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 |  |  | $ 1,800,000 | 2,000,000 |  |
Debt Instrument Maturity Date |  |  | Oct. 01, 2029 |  |  |
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% |  |  |
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% |  |  |
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] |  |  |  |  |  |
Write off of Deferred Debt Issuance Cost |  | $ 300,000 |  |  |  |
Unsecured Debt [Member] | New Credit Facility [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument Maturity Date |  |  | May 15, 2019 |  |  |

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- Definition Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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