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Summary of Significant Accounting Policies - Revenue Adjustment - Income Statement (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Revenues: |  |  |  |
Total revenues | $ 240,502 | $ 221,312 | $ 486,527 | $ 453,701
Right-to-use contract commissions, deferred, net | (262) | (112) | (286) | (196)
Operating Expenses [Abstract] |  |  |  |
Total expenses | 192,946 | 177,889 | 375,989 | 348,354
Consolidated net income | 49,169 | 44,463 | 113,346 | 107,537
Net income available for Common Stockholders | $ 46,137 | $ 39,498 | $ 106,359 | $ 96,385
Earnings per common share - Basic (usd per share) | $ 0.52 | $ 0.46 | $ 1.20 | $ 1.12
Earnings per common share - Fully Diluted (usd per share) | $ 0.52 | $ 0.45 | $ 1.20 | $ 1.11
Calculated under Revenue Guidance in Effect before Topic 606 |  |  |  |
Revenues: |  |  |  |
Total revenues | $ 241,237 |  | $ 487,996 |
Right-to-use contract commissions, deferred, net | (43) |  | 164 |
Operating Expenses [Abstract] |  |  |  |
Total expenses | 193,165 |  | 376,439 |
Consolidated net income | 49,685 |  | 114,365 |
Net income available for Common Stockholders | $ 46,629 |  | $ 107,323 |
Earnings per common share - Basic (usd per share) | $ 0.53 |  | $ 1.21 |
Earnings per common share - Fully Diluted (usd per share) | $ 0.53 |  | $ 1.21 |
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 |  |  |  |
Revenues: |  |  |  |
Total revenues | $ (735) |  | $ (1,469) |
Right-to-use contract commissions, deferred, net | 219 |  | 450 |
Operating Expenses [Abstract] |  |  |  |
Total expenses | (219) |  | (450) |
Consolidated net income | (516) |  | (1,019) |
Net income available for Common Stockholders | $ (492) |  | $ (964) |
Earnings per common share - Basic (usd per share) | $ (0.01) |  | $ (0.01) |
Earnings per common share - Fully Diluted (usd per share) | $ (0.01) |  | $ (0.01) |
Right-to-use contract upfront payments, deferred, net |  |  |  |
Revenues: |  |  |  |
Right-to-use contract upfront payments, deferred, net | $ (2,021) | $ (1,321) | $ (3,306) | $ (2,096)
Right-to-use contract upfront payments, deferred, net | Calculated under Revenue Guidance in Effect before Topic 606 |  |  |  |
Revenues: |  |  |  |
Right-to-use contract upfront payments, deferred, net | (1,286) |  | (1,837) |
Right-to-use contract upfront payments, deferred, net | Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 |  |  |  |
Revenues: |  |  |  |
Right-to-use contract upfront payments, deferred, net | $ 735 |  | $ 1,469 |

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