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Selected Quarterly Financial Data (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 164,413us-gaap_Revenues	$ 162,853us-gaap_Revenues	$ 160,521us-gaap_Revenues	$ 167,201us-gaap_Revenues	$ 157,901us-gaap_Revenues	$ 161,283us-gaap_Revenues	$ 158,114us-gaap_Revenues	$ 163,169us-gaap_Revenues	$ 654,988us-gaap_Revenues	$ 640,467us-gaap_Revenues	$ 849,928us-gaap_Revenues
Operating Margin	91,941us-gaap_GrossProfit	91,629us-gaap_GrossProfit	94,473us-gaap_GrossProfit	97,072us-gaap_GrossProfit	91,199us-gaap_GrossProfit	93,043us-gaap_GrossProfit	91,026us-gaap_GrossProfit	94,424us-gaap_GrossProfit	375,115us-gaap_GrossProfit	369,692us-gaap_GrossProfit	391,944us-gaap_GrossProfit
Net income	$ (22,425)us-gaap_NetIncomeLoss	$ 18,887us-gaap_NetIncomeLoss	$ 19,167us-gaap_NetIncomeLoss	$ 20,824us-gaap_NetIncomeLoss	$ 18,131us-gaap_NetIncomeLoss	$ 18,730us-gaap_NetIncomeLoss	$ 16,937us-gaap_NetIncomeLoss	$ 18,239us-gaap_NetIncomeLoss	$ 36,453us-gaap_NetIncomeLoss	$ 72,037us-gaap_NetIncomeLoss	$ 127,674us-gaap_NetIncomeLoss
Basic (USD per share)	$ (1.18)us-gaap_EarningsPerShareBasic	$ 0.99us-gaap_EarningsPerShareBasic	$ 1.00us-gaap_EarningsPerShareBasic	$ 1.09us-gaap_EarningsPerShareBasic	$ 0.95us-gaap_EarningsPerShareBasic	$ 0.98us-gaap_EarningsPerShareBasic	$ 0.88us-gaap_EarningsPerShareBasic	$ 0.95us-gaap_EarningsPerShareBasic	$ 1.92us-gaap_EarningsPerShareBasic	$ 3.75us-gaap_EarningsPerShareBasic	$ 6.81us-gaap_EarningsPerShareBasic
Diluted (USD per share)		$ 0.99us-gaap_EarningsPerShareDiluted	$ 1.00us-gaap_EarningsPerShareDiluted	$ 1.08us-gaap_EarningsPerShareDiluted	$ 0.94us-gaap_EarningsPerShareDiluted	$ 0.97us-gaap_EarningsPerShareDiluted	$ 0.87us-gaap_EarningsPerShareDiluted	$ 0.93us-gaap_EarningsPerShareDiluted	$ 1.90us-gaap_EarningsPerShareDiluted	$ 3.70us-gaap_EarningsPerShareDiluted	$ 6.63us-gaap_EarningsPerShareDiluted

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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