CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues	$ 648,325us-gaap_SalesRevenueNet	$ 667,398us-gaap_SalesRevenueNet	$ 645,536us-gaap_SalesRevenueNet
Cost of sales	467,045us-gaap_CostOfGoodsAndServicesSold	474,403us-gaap_CostOfGoodsAndServicesSold	422,031us-gaap_CostOfGoodsAndServicesSold
Gross profit	181,280us-gaap_GrossProfit	192,995us-gaap_GrossProfit	223,505us-gaap_GrossProfit
Selling, general and administrative expenses	72,535	68,447	64,033
Start-up costs	811crr_StartUpCosts	0crr_StartUpCosts	68crr_StartUpCosts
Loss (gain) on disposal or impairment of assets	15,079	(43)	518
Operating profit	92,855us-gaap_OperatingIncomeLoss	124,591us-gaap_OperatingIncomeLoss	158,886us-gaap_OperatingIncomeLoss
Other income (expense):
Interest income, net	597	777	64
Foreign currency exchange loss, net	(303)	(17)	(76)
Other, net	(278)us-gaap_OtherNonoperatingIncomeExpense	(150)us-gaap_OtherNonoperatingIncomeExpense	(284)us-gaap_OtherNonoperatingIncomeExpense
Nonoperating expense, total	16us-gaap_NonoperatingIncomeExpense	610us-gaap_NonoperatingIncomeExpense	(296)us-gaap_NonoperatingIncomeExpense
Income before income taxes	92,871	125,201	158,590
Income taxes	37,283us-gaap_IncomeTaxExpenseBenefit	40,315us-gaap_IncomeTaxExpenseBenefit	52,657us-gaap_IncomeTaxExpenseBenefit
Net income	$ 55,588us-gaap_NetIncomeLoss	$ 84,886us-gaap_NetIncomeLoss	$ 105,933us-gaap_NetIncomeLoss
Earnings per share:
Basic	$ 2.41us-gaap_EarningsPerShareBasic	$ 3.67us-gaap_EarningsPerShareBasic	$ 4.59us-gaap_EarningsPerShareBasic
Diluted	$ 2.41us-gaap_EarningsPerShareDiluted	$ 3.67us-gaap_EarningsPerShareDiluted	$ 4.59us-gaap_EarningsPerShareDiluted

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