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Supplemental Cash Flows (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Supplemental Cash Flow Information [Line Items]
Income taxes	$ 17,403us-gaap_IncomeTaxesPaid	$ 18,115us-gaap_IncomeTaxesPaid	$ 16,926us-gaap_IncomeTaxesPaid
Interest expense	577us-gaap_InterestPaidNet	571us-gaap_InterestPaidNet	670us-gaap_InterestPaidNet
Noncash investing activities:
Acquisition of property and equipment for which payment is pending	$ 749us-gaap_CapitalExpendituresIncurredButNotYetPaid	$ 804us-gaap_CapitalExpendituresIncurredButNotYetPaid	$ 390us-gaap_CapitalExpendituresIncurredButNotYetPaid

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Future cash outflow to pay for purchases of fixed assets that have occurred.

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income.

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The amount of cash paid for interest during the period net of cash paid for interest that is capitalized.

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