Other Long-Term Obligations - Narrative (Details) - USD ($) |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
Apr. 23, 2015 |
|
| Income Tax Examination [Line Items] | |||
| Deferred gain on sale leaseback | $ 6,703,000 | $ 6,978,000 | $ 7,414,000 |
| Sale Leaseback Transaction, Current Period Gain Recognized | 265,000 | $ 171,000 | |
| Convertible Subordinated Debt | Convertible Senior Notes at 5.00% February 2021 [Member] | |||
| Income Tax Examination [Line Items] | |||
| Debt Instrument, Face Amount | $ 150,000,000 | ||
| Interest rate (as a percent) | 5.00% | ||