Organization, Proposed Merger And Bases Of Presentation (Impact To Previously Reported Statement Of Cash Flows) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Organization And Basis Of Presentation [Line Items]
Unrealized foreign currency gains, net	$ (3,429)	$ (3,346)
Net cash provided by operating activities	52,248	69,644
Effect of exchange rate changes in cash and cash equivalents	(296)	4,537
Net impact	27,841	(71,118)
As Previously Reported [Member]
Organization And Basis Of Presentation [Line Items]
Changes in operating assets and liabilities, net of effects of acquisitions		48,912
Net cash provided by operating activities		71,327
Effect of exchange rate changes in cash and cash equivalents		2,854
Net impact
As Adjusted [Member]
Organization And Basis Of Presentation [Line Items]
Unrealized foreign currency gains, net		(3,459)	[1]
Changes in operating assets and liabilities, net of effects of acquisitions		50,688
Net cash provided by operating activities		69,644	[1]
Effect of exchange rate changes in cash and cash equivalents		4,537
Net impact
Impact [Member]
Organization And Basis Of Presentation [Line Items]
Unrealized foreign currency gains, net		(3,459)
Changes in operating assets and liabilities, net of effects of acquisitions		1,776
Net cash provided by operating activities		(1,683)
Effect of exchange rate changes in cash and cash equivalents		1,683
Net impact

[1] Refer to the above section "Impact of Change in Consolidated Statement of Cash Flows Presentation to Prior Periods".