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Summary of Significant Accounting Policies - Adoption of New Accounting Standard (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended |  |  |
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2019 | Jan. 01, 2018 | Jan. 01, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect from the adoption of ASU 2014-09 (as described in Note 2) |  |  |  |  |  |  |  |  |  |  |  |  | $ (15,186) |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred commission expense |  |  |  |  | $ 31,443 |  |  |  |  | $ 31,443 |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred revenue-upfront payment from right-to-use contracts | $ 116,363 |  |  |  | 85,596 |  |  |  | $ 116,363 | 85,596 | $ 81,484 |  | 108,983 | $ 81,484
Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution in excess of accumulated earnings | (211,034) |  |  |  | (211,980) |  |  |  | (211,034) | (211,980) |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Right-to-use contract upfront payments, deferred, net |  |  |  |  |  |  |  |  |  | 14,132 |  |  |  |
Total revenues | $ 243,451 | $ 256,675 | $ 240,502 | $ 246,025 | $ 229,986 | $ 241,625 | $ 221,312 | $ 232,389 | 986,653 | 925,312 | 870,435 |  |  |
Expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |
Right-to-use contract commissions, deferred, net |  |  |  |  |  |  |  |  | (813) | (354) | (223) |  |  |
Total expenses |  |  |  |  |  |  |  |  | 765,206 | 718,700 | 685,908 |  |  |
Consolidated net income |  |  |  |  |  |  |  |  | 226,386 | 210,377 | 187,132 |  |  |
Net income available for Common Stockholders |  |  |  |  |  |  |  |  | $ 212,596 | $ 189,904 | $ 164,037 |  |  |
Earnings per Common Share – Basic (usd per share) | $ 0.56 | $ 0.63 | $ 0.52 | $ 0.68 | $ 0.51 | $ 0.56 | $ 0.46 | $ 0.66 | $ 2.39 | $ 2.18 | $ 1.93 |  |  |
Earnings per Common Share – Fully Diluted (usd per share) | $ 0.56 | $ 0.63 | $ 0.52 | $ 0.68 | $ 0.51 | $ 0.56 | $ 0.45 | $ 0.65 | $ 2.38 | $ 2.17 | $ 1.92 |  |  |
Effect of Change Higher/(Lower) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred commission expense |  |  |  |  |  |  |  |  |  |  |  |  | 39,643 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred revenue-upfront payment from right-to-use contracts |  |  |  |  |  |  |  |  |  |  |  |  | 108,982 |
Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution in excess of accumulated earnings |  |  |  |  |  |  |  |  |  |  |  |  | (227,166) |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | $ (2,980) |  |  |  |  |
Expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |
Right-to-use contract commissions, deferred, net |  |  |  |  |  |  |  |  | 868 |  |  |  |  |
Total expenses |  |  |  |  |  |  |  |  | (868) |  |  |  |  |
Consolidated net income |  |  |  |  |  |  |  |  | (2,102) |  |  |  |  |
Net income available for Common Stockholders |  |  |  |  |  |  |  |  | $ (1,989) |  |  |  |  |
Earnings per Common Share – Basic (usd per share) |  |  |  |  |  |  |  |  | $ (0.02) |  |  |  |  |
Earnings per Common Share – Fully Diluted (usd per share) |  |  |  |  |  |  |  |  | $ (0.02) |  |  |  |  |
Adjustment due to ASU 2014-09 Adoption | Balances Without Adoption of ASU 2014-09 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred commission expense |  |  |  |  |  |  |  |  |  |  |  |  | 8,200 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred revenue-upfront payment from right-to-use contracts |  |  |  |  |  |  |  |  |  |  |  |  | 23,386 |
Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution in excess of accumulated earnings |  |  |  |  |  |  |  |  |  |  |  |  | (15,186) |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | $ 989,633 |  |  |  |  |
Expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |
Right-to-use contract commissions, deferred, net |  |  |  |  |  |  |  |  | 55 |  |  |  |  |
Total expenses |  |  |  |  |  |  |  |  | 766,074 |  |  |  |  |
Consolidated net income |  |  |  |  |  |  |  |  | 228,488 |  |  |  |  |
Net income available for Common Stockholders |  |  |  |  |  |  |  |  | $ 214,585 |  |  |  |  |
Earnings per Common Share – Basic (usd per share) |  |  |  |  |  |  |  |  | $ 2.41 |  |  |  |  |
Earnings per Common Share – Fully Diluted (usd per share) |  |  |  |  |  |  |  |  | $ 2.40 |  |  |  |  |
Right-to-use contract upfront payments, deferred, net |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred revenue-upfront payment from right-to-use contracts | $ 116,363 |  |  |  | $ 85,596 |  |  |  | $ 116,363 | $ 85,596 |  |  |  |
Right-to-use contract upfront payments, deferred, net | Effect of Change Higher/(Lower) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Right-to-use contract upfront payments, deferred, net |  |  |  |  |  |  |  |  | 2,980 |  |  |  |  |
Right-to-use contract upfront payments, deferred, net | Adjustment due to ASU 2014-09 Adoption | Balances Without Adoption of ASU 2014-09 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Right-to-use contract upfront payments, deferred, net |  |  |  |  |  |  |  |  | $ (4,400) |  |  |  |  |
Scenario, Forecast | Subsequent Event | Accounting Standards Update 2016-02 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease liability |  |  |  |  |  |  |  |  |  |  |  | $ 18,000 |  |
Straight-line rent liability |  |  |  |  |  |  |  |  |  |  |  | 1,000 |  |
Operating lease asset |  |  |  |  |  |  |  |  |  |  |  | $ 19,000 |  |
Distributions in Excess of Accumulated Earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect from the adoption of ASU 2014-09 (as described in Note 2) |  |  |  |  |  |  |  |  |  |  |  |  | (15,186) |
Distributions in Excess of Accumulated Earnings | Adjustment due to ASU 2014-09 Adoption |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect from the adoption of ASU 2014-09 (as described in Note 2) |  |  |  |  |  |  |  |  |  |  |  |  | $ 15,200 |

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