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Debt - Senior Unsecured Credit Facility (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Dec. 31, 2016 USD ($)
Line of Credit Facility [Line Items] |  |  |  |  |
Percent of unused portion line of credit facility triggering lower commitment fee (as a percent) |  |  | 50.00% |  |
Net proceeds from future equity issuances (as a percent) |  |  | 75.00% |  |
Unsecured credit facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Maximum borrowing capacity (up to) | $ 300,000,000 |  | $ 300,000,000 |  |
Increase in credit facility | 600,000,000 |  | 600,000,000 |  |
Senior unsecured credit facility | 0 |  | 0 |  | $ 0
Interest and unused credit facility fees | $ 200,000 | $ 200,000 | $ 700,000 | $ 1,100,000 |
Minimum |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Line of credit facility, unused capacity, commitment fee (as a percent) |  |  | 0.20% |  |
Maximum |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Line of credit facility, unused capacity, commitment fee (as a percent) |  |  | 0.30% |  |
Line Of Credit Facility Covenant Actual Results |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Maximum leverage ratio (as a percent) | 0.244 |  | 0.244 |  |
Minimum fixed charge coverage ratio |  |  | 4.46 |  |
Minimum tangible net worth | $ 2,570,000,000 |  | $ 2,570,000,000 |  |
Secured recourse indebtedness ratio |  |  | 21.20% |  |
Line Of Credit Facility Covenant |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Maximum leverage ratio (as a percent) | 0.60 |  | 0.60 |  |
Minimum fixed charge coverage ratio |  |  | 1.5 |  |
Minimum tangible net worth | $ 1,913,306,000 |  | $ 1,913,306,000 |  |
Secured recourse indebtedness ratio |  |  | 45.00% |  |
LIBOR | Unsecured credit facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Basis spread on variable rate |  |  | 150.00% |  |
LIBOR | Minimum | Unsecured credit facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Basis spread on variable rate |  |  | 1.75% |  |
LIBOR | Maximum | Unsecured credit facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Basis spread on variable rate |  |  | 2.75% |  |
Less than or equal to 35% | Maximum | Unsecured credit facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Ratio of net indebtedness to EBITDA |  |  | 0.35 |  |
Less than or equal to 35% | LIBOR | Unsecured credit facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Basis spread on variable rate |  |  | 1.50% |  |
Greater than 35% but less than or equal to 45% | Minimum | Unsecured credit facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Ratio of net indebtedness to EBITDA |  |  | 0.35 |  |
Greater than 35% but less than or equal to 45% | Maximum | Unsecured credit facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Ratio of net indebtedness to EBITDA |  |  | 0.45 |  |
Greater than 35% but less than or equal to 45% | LIBOR | Unsecured credit facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Basis spread on variable rate |  |  | 1.65% |  |
Greater than 45% but less than or equal to 50% | Minimum | Unsecured credit facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Ratio of net indebtedness to EBITDA |  |  | 0.45 |  |
Greater than 45% but less than or equal to 50% | Maximum | Unsecured credit facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Ratio of net indebtedness to EBITDA |  |  | 0.50 |  |
Greater than 45% but less than or equal to 50% | LIBOR | Unsecured credit facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Basis spread on variable rate |  |  | 1.80% |  |
Greater than 50% but less than or equal to 55% | Minimum | Unsecured credit facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Ratio of net indebtedness to EBITDA |  |  | 0.50 |  |
Greater than 50% but less than or equal to 55% | Maximum | Unsecured credit facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Ratio of net indebtedness to EBITDA |  |  | 0.55 |  |
Greater than 50% but less than or equal to 55% | LIBOR | Unsecured credit facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Basis spread on variable rate |  |  | 2.00% |  |
Greater than 55% | Minimum | Unsecured credit facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Ratio of net indebtedness to EBITDA |  |  | 0.55 |  |
Greater than 55% | LIBOR | Unsecured credit facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Basis spread on variable rate |  |  | 2.25% |  |

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- Definition Line of credit facility interest and commitment fee amount. + References No definition available. + Details
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- Definition Percent Of Unused Portion Line Of Credit Facility Triggering Commitment Fee Percentage + References No definition available. + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + 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 FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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