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Income Taxes - Income Tax Reconciliation (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Provision at statutory rate |  |  |  |  |  |  |  |  | $ 33,367 | $ 24,561 | $ 28,892
Provision at statutory rate (as a percent) |  |  |  |  |  |  |  |  | 35.00% | 35.00% | 35.00%
Non-taxable REIT income |  |  |  |  |  |  |  |  | $ (29,857) | $ (20,672) | $ (25,733)
Non-taxable REIT income (as a percent) |  |  |  |  |  |  |  |  | (31.30%) | (29.50%) | (31.20%)
State and local tax provision |  |  |  |  |  |  |  |  | $ 2,130 | $ 187 | $ 1,284
State and local tax provision (as a percent) |  |  |  |  |  |  |  |  | 2.20% | 0.30% | 1.60%
Other |  |  |  |  |  |  |  |  | $ 1,511 | $ (502) | $ 24,047
Other (as a percent) |  |  |  |  |  |  |  |  | 1.60% | (0.70%) | 29.10%
Valuation allowance |  |  |  |  |  |  |  |  | $ (3,796) | $ (479) | $ (23,955)
Valuation allowance (as a percent) |  |  |  |  |  |  |  |  | (4.00%) | (0.70%) | (29.00%)
Total provision | $ 1,169 | $ 507 | $ 442 | $ 1,237 | $ 375 | $ 163 | $ 2,366 | $ 191 | $ 3,355 | $ 3,095 | $ 4,535
Total provision (as a percent) |  |  |  |  |  |  |  |  | 3.50% | 4.40% | 5.50%

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 + Details
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