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Debt - Schedule of Debt Covenants (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($)
Line of Credit Facility [Line Items] |
Percent of net proceeds from future equity issuances | 75.00%
Line Of Credit Facility Covenant |
Line of Credit Facility [Line Items] |
Maximum leverage ratio (as a percent) | 0.60
Minimum fixed charge coverage ratio | 1.50
Minimum tangible net worth | $ 1,910
Secured recourse indebtedness | 45.00%
Line Of Credit Facility Covenant Actual Results |
Line of Credit Facility [Line Items] |
Maximum leverage ratio (as a percent) | 0.246
Minimum fixed charge coverage ratio | 4.42
Minimum tangible net worth | $ 2,600
Secured recourse indebtedness | 21.40%

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- Definition Line Of Credit Facility Covenant Percent of Net Proceeds From Future Equity Issuances + References No definition available. + Details
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