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Debt - Senior Unsecured Notes (Details) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Aug. 31, 2014 USD ($) d $ / shares | Dec. 31, 2016 USD ($) $ / shares | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Mar. 31, 2015 USD ($)
Debt Instrument [Line Items] |  |  |  |  |
Proceeds from mortgage notes payable |  | $ 50,000,000 | $ 0 | $ 191,000,000 |
Senior unsecured notes |  | 590,388,000 | 587,018,000 |  |
Interest expense |  | 71,147,000 | 67,492,000 | 66,456,000 |
Amortization of deferred financing costs |  | $ 5,000,000 | 6,100,000 | 7,600,000 |
Convertible Debt [Member] | Exchangeable Senior Notes due August 15, 2019 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Face amount | $ 250,000,000 |  |  |  |
Stated interest rate | 2.625% | 2.625% |  |  |
Proceeds from mortgage notes payable | $ 246,900,000 |  |  |  |
Conversion price (USD per share) | $ / shares | $ 19.45 | $ 19.39 |  |  |
Debt, conversion ratio | 0.0514059 | 0.0515600 |  |  |
Percentage of principal amount redeemed | 100.00% |  |  |  |
Effective interest rate | 3.80% | 3.93% |  |  |
Senior unsecured notes | $ 236,600,000 |  |  |  |
Embedded conversion option |  | $ 13,400,000 | 13,400,000 |  |
Remaining discount amortization period | 5 years |  |  |  |
Unamortized discount |  | 7,000,000 | 9,700,000 |  |
Underwriting expense | $ 3,100,000 |  |  |  |
Deferred finance costs | $ 2,900,000 |  |  |  |
Embedded conversion feature, embedded |  | 200,000 | 200,000 |  |
Interest expense on note |  | 9,900,000 | 9,900,000 | 3,800,000 |
Interest expense |  | 6,600,000 | 6,600,000 | 2,500,000 |
Accretion of debt discount |  | 2,700,000 | 2,700,000 | 1,100,000 |
Amortization of deferred financing costs |  | $ 600,000 | $ 600,000 | $ 200,000 |
Senior Notes [Member] | Series A, Series B, and Series C Senior Unsecured Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Face amount |  |  |  |  | $ 350,000,000
Senior Notes [Member] | Series A Senior Notes due 2025 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Face amount |  |  |  |  | $ 100,000,000
Stated interest rate |  | 3.93% |  |  | 3.93%
Effective interest rate |  | 4.03% |  |  |
Senior Notes [Member] | Series B Senior Notes due 2027 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Face amount |  |  |  |  | $ 125,000,000
Stated interest rate |  | 4.09% |  |  | 4.09%
Effective interest rate |  | 4.19% |  |  |
Senior Notes [Member] | Series C Senior Notes due 2030 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Face amount |  |  |  |  | $ 125,000,000
Stated interest rate |  | 4.18% |  |  | 4.18%
Effective interest rate |  | 4.28% |  |  |
Covenant scenario one [Member] | Convertible Debt [Member] | Exchangeable Senior Notes due August 15, 2019 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Threshold percentage of stock price trigger | 130.00% |  |  |  |
Threshold trading days | d | 20 |  |  |  |
Threshold consecutive trading days | 30 days |  |  |  |
Covenant scenario two [Member] | Convertible Debt [Member] | Exchangeable Senior Notes due August 15, 2019 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Threshold percentage of stock price trigger | 98.00% |  |  |  |
Threshold consecutive business days | 5 days |  |  |  |

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- Definition Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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