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Schedule II - Valuation and Qualifying Accounts - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member] |  |  |  |
Balance at beginning of period |  | $ 45,413 | $ 54,155 | $ 95,126
Charged to expenses |  | 0 | 0 | 0
Adjustments to valuation accounts |  | (2,710) | (8,742) | (40,971)
Deductions |  | 0 | 0 | 0
Balance at end of period |  | 42,703 | 45,413 | 54,155
SEC Schedule, 12-09, Allowance, Credit Loss [Member] |  |  |  |
Balance at beginning of period | [1] | $ 20,438 | 17,066 | 24,175
Charged to expenses | [1] |  | 9,254 | 6,641
Adjustments to valuation accounts | [1] |  | 0 | 0
Deductions | [1] |  | (5,882) | (13,750)
Balance at end of period | [1] |  | $ 20,438 | $ 17,066
[1] | Includes allowances on accounts receivable and straight-line rents.

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- Definition Amount of increase (decrease) in valuation and qualifying accounts and reserves from adjustment. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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