Other Long-Term Assets Components of Other Long-Term Assets(Details) - USD ($)	Mar. 31, 2017	Dec. 31, 2016
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Convertible note hedge asset	$ 19,641,000	$ 25,471,000
Cash surrender value of life insurance policies	1,847,000	1,824,000
Deferred financing fees	820,000	793,000
Installment receivables	528,000	466,000
Deferred taxes	334,000	837,000
Investments	104,000	108,000
Other	106,000	188,000
Other Assets	$ 23,380,000	$ 29,687,000