Comprehensive Income (Details) (USD $) In Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Comprehensive Income [Abstract]
Net income	$ 48,336	$ 38,564	$ 146,469	$ 115,587
Unrealized loss on derivatives, net of tax	(22,162)	(9,080)	(20,398)	(23,076)
Pension and other post-retirement plans, net of tax	777	(12)	2,354	728
Cumulative translation adjustment	(26,437)	38,678	5,100	(12,187)
Comprehensive income	$ 514	$ 68,150	$ 133,525	$ 81,052

The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the reporting entity. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, but excludes any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

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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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+ Details

- Definition

The adjustment out of other comprehensive income for prior service costs recognized as a component of net period benefit cost during the period, after tax.

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Adjustment that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency of the reporting entity, net of tax.

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Change in accumulated gains and losses from derivative instrument designated and qualifying as the effective portion of cash flow hedges, net of tax effect. The after tax effect change includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

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