Retirement And Other Benefit Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Deferred Compensation Arrangement with Individual, Postretirement Benefits
Employer contributions to defined contribution plan	$ 2,500	$ 1,800	$ 1,400
Other long-term liabilities	35,509	26,108
Accrued expenses and other current liabilities	26,995	21,662
Deferred Compensation
Deferred Compensation Arrangement with Individual, Postretirement Benefits
Compensation deferred by participants	1,200	1,600	1,700
Amount withdrawn from the Plan by participants	800	400	$ 200
Other long-term liabilities	11,700	10,700
Accrued expenses and other current liabilities	$ 200	$ 800