Summary of Significant Accounting Policies - Deferred Charges (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| Accounting Policies [Abstract] | |||
| Deferred Lease Costs Capitalized | $ 6,584 | $ 7,013 | $ 7,803 |
| Deferred lease costs amount related to salaries and related costs | $ 6,098 | $ 6,210 | $ 6,236 |
| X | ||||||||||
- Definition Deferred Lease Costs Capitalized - Deferred Lease Costs Capitalized during the period include internal lease costs and amounts paid to third-party brokers. No definition available.
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| X | ||||||||||
- Definition Deferred lease costs amount related to salaries and related costs No definition available.
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| X | ||||||||||
- References No definition available.
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