Other Long-Term Assets - Narrative (Details) - USD ($) |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2016 |
|
| Debt Instrument [Line Items] | |||
| Proceeds from sale of life insurance policies | $ 11,902,000 | $ 21,338,000 | |
| Convertible Senior Notes at 5.00% February 2021 [Member] | Convertible Subordinated Debt | |||
| Debt Instrument [Line Items] | |||
| Debt Instrument, Face Amount | $ 150,000,000 | ||