Other Long-Term Liabilities (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Other Long-Term Liabilities [Abstract]
Vesting period	4 years
Vested amounts under the non-qualified deferred compensation plan	$ 1,600,000	$ 4,400,000
Current portions of the non-qualified deferred compensation plan	5,900,000	$ 4,100,000
Estimated future plan payments under non-qualified deferred compensation plan [Abstract]
2017	5,900,000
2018	100,000
2019	37,000
2020	200,000
2021	$ 10,000