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Includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits are not generally reported as cash and cash equivalents. Includes cash and cash equivalents associated with the entity's continuing operations. Excludes cash and cash equivalents associated with the disposal group (and discontinued operation).

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Company may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months.

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Including the current and noncurrent portions, the carrying value of convertible subordinated debt, as of the balance sheet date, initially scheduled to be repaid after one year or beyond the normal operating cycle if longer. This form of debt can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder, and places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets.

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Fair value as of the balance sheet date of all foreign currency derivative assets not designated as hedging instruments.

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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Carrying value as of the balance sheet date , including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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Fair Values of Financial Instruments Schedule of Fair Values of Financial Instruments (Details) In Thousands	Jun. 30, 2011 USD ($)	Dec. 31, 2010 USD ($)	Jun. 30, 2010 USD ($)	Dec. 31, 2009 USD ($)	Jun. 30, 2011 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member] USD ($)	Dec. 31, 2010 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member] USD ($)	Jun. 30, 2011 USD Denominated Term Loan [Member] USD ($)	Dec. 31, 2010 USD Denominated Term Loan [Member] USD ($)	Jun. 30, 2011 EUR Denominated Term Loan [Member] EUR (€)	Jun. 30, 2011 EUR Denominated Term Loan [Member] USD ($)	Dec. 31, 2010 EUR Denominated Term Loan [Member] EUR (€)	Dec. 31, 2010 EUR Denominated Term Loan [Member] USD ($)
Assets
Cash and cash equivalents	$ 168,284	$ 169,477	$ 137,371	$ 121,893
Cash and cash equivalents, at fair value	168,284	169,477
Foreign exchange forwards, asset	171	63
Foreign exchange forwards, asset, at fair value					171	63
Liabilities
Term loans							200,616	218,642	105,800	151,350	132,400	174,031
Term loans, at fair value							201,619	219,462		152,107		174,684
Convertible senior subordinated debt	223,604	218,268
Convertible senior subordinated notes, at fair value	224,163	236,461
Interest rate swaps	2,577	6,820
Interest rate swaps, at fair value					2,577	6,820
Foreign exchange forwards, liability	200	457
Foreign exchange forwards, liability, at fair value					$ 200	$ 457