Goodwill and Intangible Assets - Amortization (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Goodwill and Intangible Assets | |||
| Aggregate amortization expense | $ 9,389 | $ 13,499 | $ 18,867 |
| Amortization of leasehold interests | 1,252 | 794 | |
| Estimated annual intangible asset amortization expense | |||
| 2017 | 9,638 | ||
| 2018 | 9,060 | ||
| 2019 | 9,035 | ||
| 2020 | 8,897 | ||
| 2021 | 8,897 | ||
| Thereafter | 19,486 | ||
| Net intangible assets | $ 65,013 | $ 75,694 | |