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Retirement And Other Benefit Plans (Details) (USD $)	12 Months Ended
Retirement And Other Benefit Plans (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Employer contributions to defined contribution plan	$ 1,800,000	$ 1,400,000	$ 1,100,000
Other long-term liabilities	26,108,000us-gaap_OtherLiabilitiesNoncurrent	21,380,000us-gaap_OtherLiabilitiesNoncurrent
Accrued expenses and other current liabilities	21,662,000us-gaap_OtherAccruedLiabilitiesCurrent	17,108,000us-gaap_OtherAccruedLiabilitiesCurrent
Deferred Compensation [Member]
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Compensation deferred by participants	1,600,000	1,700,000	1,900,000
Amount withdrawn from the Plan by participants	400,000	200,000	0
Other long-term liabilities	10,700,000	9,400,000
Accrued expenses and other current liabilities	$ 800,000	$ 200,000

Carrying value as of the balance sheet date of obligations incurred through that date and payable arising from transactions not otherwise specified in the taxonomy. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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