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Supplemental Cash Flow Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Supplemental disclosure:
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Income taxes paid	4,203us-gaap_IncomeTaxesPaidNet	683us-gaap_IncomeTaxesPaidNet
Non-cash investing and financing activities:
Non-cash capital expenditures	$ (71)us-gaap_CapitalExpendituresIncurredButNotYetPaid	$ 2us-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, net of any cash received during the current period as refunds for the overpayment of taxes.

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