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Fair Value Measurements (Details) (USD $) | 9 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |  |  |  |  |  |
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Sep. 30, 2012 | Sep. 30, 2012 Contingent Consideration [Member] | Jun. 30, 2012 Contingent Consideration [Member] | Mar. 31, 2012 Contingent Consideration [Member] | Sep. 30, 2011 Contingent Consideration [Member] | Jun. 30, 2011 Contingent Consideration [Member] | Mar. 31, 2011 Contingent Consideration [Member] | Sep. 30, 2012 Auction Rate Securities [Member] | Jun. 30, 2012 Auction Rate Securities [Member] | Mar. 31, 2012 Auction Rate Securities [Member] | Sep. 30, 2011 Auction Rate Securities [Member] | Jun. 30, 2011 Auction Rate Securities [Member] | Mar. 31, 2011 Auction Rate Securities [Member] | Sep. 30, 2012 Term Loan [Member] | Sep. 30, 2012 Minimum [Member] | Sep. 30, 2012 Minimum [Member] Contingent Consideration [Member] | Sep. 30, 2012 Maximum [Member] | Sep. 30, 2012 Maximum [Member] Contingent Consideration [Member] | Sep. 30, 2012 Fair Value Measured on a Recurring Basis [Member] Quoted prices in active markets (Level 1) [Member] | Dec. 31, 2011 Fair Value Measured on a Recurring Basis [Member] Quoted prices in active markets (Level 1) [Member] | Sep. 30, 2012 Fair Value Measured on a Recurring Basis [Member] Significant other observable inputs (Level 2) [Member] | Dec. 31, 2011 Fair Value Measured on a Recurring Basis [Member] Significant other observable inputs (Level 2) [Member] | Sep. 30, 2012 Fair Value Measured on a Recurring Basis [Member] Significant unobservable inputs (Level 3) [Member] | Dec. 31, 2011 Fair Value Measured on a Recurring Basis [Member] Significant unobservable inputs (Level 3) [Member] | Sep. 30, 2012 Carrying Amount [Member] | Dec. 31, 2011 Carrying Amount [Member] | Sep. 30, 2012 Fair Value [Member]
Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and Cash Equivalents |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 180,777,000 | [1] | $ 204,240,000 | [1] | $ 0 | [1] | $ 0 | [1] | $ 0 | [1] | $ 0 | [1] | $ 180,777,000 | [1] | $ 204,240,000 | [1] |
Restricted Cash |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 38,700,000 | [1] | 35,437,000 | [1] | 0 | [1] | 0 | [1] | 0 | [1] |  |  | 38,700,000 | [1] | 35,437,000 | [1] |
Short term investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | [2] | 1,026,000 | [2] | 3,555,000 | [2] | 2,439,000 | [2] |  |  | 0 | [2] | 3,555,000 | [2] | 3,465,000 | [2] |
Bonds substituted for retainage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | [3] | 0 | [3] | 14,893,000 | [3] | 12,488,000 | [3] | 0 | [3] | 0 | [3] | 14,893,000 | [3] | 12,488,000 | [3] |
Long-term Investments - Auction rate securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | [4] | 0 | [4] | 0 | [4] | 0 | [4] | 46,283,000 | [4] | 62,311,000 | [4] | 46,283,000 | [4] | 62,311,000 | [4] |
Total Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 219,477,000 |  | 240,703,000 |  | 18,448,000 |  | 14,927,000 |  | 46,283,000 |  | 62,311,000 |  | 284,208,000 |  | 317,941,000 |  |
Liabilities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swap contract |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | [5] | 0 | [5] | 2,214,000 | [5] | 0 | [5] | 0 | [5] | 0 | [5] | 2,214,000 | [5] | 0 | [5] |
Contingent consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | [6] | 0 | [6] | 0 | [6] | 0 | [6] | 46,706,000 | [6] | 51,555,000 | [6] | 46,706,000 | [6] | 51,555,000 | [6] |
Total Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 2,214,000 |  | 0 |  | 46,706,000 |  | 51,555,000 |  | 48,920,000 |  | 51,555,000 |  |
Fixed rate senior unsecured notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 298,200,000 |  |  |  | 303,800,000
Long-term debt, excluding fixed rate senior unsecured notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 402,600,000 |  |  |  | 402,600,000
Maturity period for cash cash equivalents and restricted cash, maximum | 3 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of auction rate securities (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 years |  | 8 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |  | 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of loan |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets measured at fair value on a recurring basis using significant unobservable inputs [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  |  |  |  |  | 46,283,000 | 46,283,000 | 62,311,000 | 88,129,000 | 88,129,000 | 88,129,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchases |  |  |  |  |  |  |  | 0 | 0 | 0 | 0 | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlements |  |  |  |  |  |  |  | 0 | 0 | (16,553,000) | 0 | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Realized loss included in other income (expense), net |  |  |  |  |  |  |  |  |  | (2,699,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reversal of pretax impairment charges included in accumulated other comprehensive income (loss) |  |  |  |  |  |  |  |  |  | 3,224,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance |  |  |  |  |  |  |  | 46,283,000 | 46,283,000 | 46,283,000 | 88,129,000 | 88,129,000 | 88,129,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated recovery period for auction rate securities |  |  |  |  |  |  |  | 12 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of auction rate securities (ARS) sold at auction for its full par value |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of auction rate securities (ARS) sold in a secondary market |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of auction rate securities (ARS) settled |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities measured at fair value on a recurring basis using significant unobservable inputs [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | 54,743,000 | 51,697,000 | 51,555,000 | 9,700,000 | 4,200,000 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value adjustments included in other income (expense), net |  | (37,000) | (298,000) | 142,000 | (1,432,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value measured at conclusion of purchase price analysis measurement period |  |  | 3,344,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration settled |  | (8,000,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value measured prior to the conclusion of purchase price analysis measurement period |  |  |  |  | 40,432,000 | 5,500,000 | 4,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance |  | $ 46,706,000 | $ 54,743,000 | $ 51,697,000 | $ 48,700,000 | $ 9,700,000 | $ 4,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value inputs, discount rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.00% | 14.00% | 7.00% | 18.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Cash, cash equivalents and restricted cash consist primarily of money market funds with original maturity dates of three months or less, for which fair value is determined through quoted market prices.
[2] | Short-term investments are classified as other current assets and are comprised of municipal bonds, the majority of which are rated Aa2 or better. The fair values of the municipal bonds are obtained from readily-available pricing sources for comparable instruments, and as such, the Company has classified these assets as Level 2.
[3] | Bonds substituted for retainage are classified as accounts receivable, including retainage and are comprised of U.S. Treasury Notes and other municipal bonds, the majority of which are rated Aa3 or better. The fair values of these assets are obtained from readily-available pricing sources for comparable instruments, and as such, the Company has classified these assets as Level 2.
[4] | At September 30, 2012 the Company had $46.3 million invested in auction rate securities ("ARS") which the Company considers as available-for-sale long-term investments. The long-term investments ARS held by the Company at September 30, 2012 are in securities collateralized by student loan portfolios. At September 30, 2012 most of the Company's ARS were rated AAA and AA+. The Company estimated the fair value of its ARS utilizing an income approach valuation model which considered, among other items, the following inputs: (i) the underlying structure of each security; (ii) the present value of future principal and interest payments discounted at rates considered to reflect current market conditions (discount rates range from 3% to 7%); (iii) consideration of the probabilities of default or repurchase at par for each period (term periods range from 6 to 8 years); (iv) prices from recent comparable transactions; and (v) other third party pricing information without adjustment. See the Level 3 ARS rollforward below for disclosure of the Company's valuation approach.
[5] | As discussed in Note 10 – Financial Commitments, the Company entered into a swap agreement with Bank of America, N.A. to establish a long-term interest rate for its $200 million five-year term loan. The swap agreement became effective for the term loan principal balance outstanding at January 31, 2012 and will remain effective through the maturity date of the term loan. The Company values the interest rate swap liability utilizing a discounted cash flow model that takes into consideration forward interest rates observable in the market and the counterparty's credit risk. This liability is classified as a component of other long-term liabilities.
[6] | The liabilities listed as of September 30, 2012 above represent the contingent consideration for the Company's recent acquisitions for which the measurement period for purchase price analysis has concluded. See the Level 3 contingent consideration rollforward below for disclosure of the Company's valuation approach.

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- Definition Derivative instrument obligations meeting the definition of a liability which the Company is a party to as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 15 -Paragraph 83 -URI http://asc.fasb.org/extlink&oid=6913464&loc=d3e34841-113949 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 10 -Subparagraph i -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 Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 6 -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. + Details
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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized in earnings, arising from assets measured at fair value on a recurring basis using unobservable inputs (level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition Purchases that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition This element represents an asset measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c -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. + Details
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- Definition This element represents a liability measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition This element represents the aggregate of the liabilities reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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