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Summary of Significant Accounting Policies (Revenue Adjustment - Income Statement) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Revenues: |  |
Right-to-use contract upfront payments, deferred, net | $ (1,285) | $ (775)
Total revenues | 246,025 | 232,389
Operating Expenses [Abstract] |  |
Right-to-use contract commissions, deferred, net | (24) | (84)
Total expenses | 183,043 | 170,464
Consolidated net income | 64,177 | 63,075
Net income available for Common Stockholders | $ 60,222 | $ 56,888
Earnings per common share - Basic (usd per share) | $ 0.68 | $ 0.66
Earnings per common share - Fully Diluted (usd per share) | $ 0.68 | $ 0.65
Calculated under Revenue Guidance in Effect before Topic 606 |  |
Revenues: |  |
Right-to-use contract upfront payments, deferred, net | $ (551) |
Total revenues | 246,759 |
Operating Expenses [Abstract] |  |
Right-to-use contract commissions, deferred, net | 207 |
Total expenses | 183,274 |
Consolidated net income | 64,680 |
Net income available for Common Stockholders | $ 60,694 |
Earnings per common share - Basic (usd per share) | $ 0.69 |
Earnings per common share - Fully Diluted (usd per share) | $ 0.68 |
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 | $ 734 |
Total revenues | 734 |
Operating Expenses [Abstract] |  |
Right-to-use contract commissions, deferred, net | 231 |
Total expenses | 231 |
Consolidated net income | 503 |
Net income available for Common Stockholders | $ 472 |
Earnings per common share - Basic (usd per share) | $ 0.01 |
Earnings per common share - Fully Diluted (usd per share) | $ 0.00 |

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