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Acquisition (Details) (USD $)	3 Months Ended		1 Months Ended
	Jun. 30, 2010	Jun. 03, 2011	Jun. 30, 2011 CRI	Jun. 03, 2011 CRI
Acquisition
Cash deposited into an escrow account until December 2012		$ 15,000,000
Shares deposited into an escrow account until December 2012 (in shares)		1,300,000
Cash or the company's common stock payable to certain CRI employees and contractors as (the Retention Bonus)		50,000,000
Period over which retention bonus is payable (in years)		3
Number of installments for payment of retention bonus		3
Approximate installment amount of retention bonus		16,700,000
Number of payments that will be made in either cash or shares of the company's common stock, at the company's option		2
Related transaction costs		3,800,000
Consideration paid by the company
Cash		168,805,000
Common Stock (in dollars per share)		88,438,000
Purchase price paid (in shares)	6,380,806		6,400,000
Issue price of shares (in dollars per shares)		$ 13.86
Total		257,243,000		257,200,000
Business acquisitions
Total		$ 257,243,000		$ 257,200,000
Purchase price paid (in shares)	6,380,806		6,400,000

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Amount of cash paid to acquire the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141
-Paragraph 51
-Subparagraph d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 68
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The acquisition-date fair value of the equity interests of the acquirer, including the number of instruments or interests issued or issuable in consideration for the business combination.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 68
-Subparagraph f(4)
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Number 141R
-Paragraph 39
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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The total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141
-Paragraph 51
-Subparagraph d
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Amount of direct costs of the business combination including legal, accounting, and other costs incurred to consummate the business acquisition.

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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141
-Paragraph 51
-Subparagraph d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141
-Paragraph 24
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Number of shares of equity interests issued or issuable to acquire entity.

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-Number 141
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