Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Pro-Rata Distributions [Line Items] | |||
| Lease term | 16 years | ||
| Lease expense for property and equipment | $ 1,988 | $ 1,856 | $ 1,724 |
| Possible losses from legal dispute, minimum | 0 | ||
| Possible losses from legal dispute, maximum | 1,500 | ||
| Distributions to non-controlling interests | $ 407 | ||
| Fiscal year 2016 | |||
| Pro-Rata Distributions [Line Items] | |||
| Pro-rata distributions, percentage of free-cash-flow | 50.00% | ||
| Fiscal year 2015 | |||
| Pro-Rata Distributions [Line Items] | |||
| Pro-rata distributions, percentage of free-cash-flow | 100.00% | ||
| DMV | |||
| Pro-Rata Distributions [Line Items] | |||
| Distributions to non-controlling interests | $ 264 | ||