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Business Combinations (Details) 2 (USD $)
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3 Months Ended |
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Mar. 31, 2013
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Jan. 31, 2012
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| Business Acquisition, Purchase Price Allocation, Assets Acquired (Liabilities Assumed), Net [Abstract] |
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| Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year |
$ 144,100,000 |
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HealthTran
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| Business Acquisition [Line Items] |
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| Cash paid to shareholders |
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250,000,000 |
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| Business Acquisition, Purchase Price Allocation, Assets Acquired (Liabilities Assumed), Net [Abstract] |
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| Customer relationships intangible |
74,530,000 |
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| Amortization of Acquired Intangible Assets |
3,600,000 |
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| Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year |
10,900,000 |
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Initial Amounts Recognized at Acquisition Date | HealthTran
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| Business Acquisition, Purchase Price Allocation, Assets Acquired (Liabilities Assumed), Net [Abstract] |
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| Total current assets |
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30,654,000 |
[1] |
| Property and equipment |
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2,787,000 |
[1] |
| Goodwill |
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173,642,000 |
[1] |
| Customer relationships intangible |
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77,130,000 |
[1] |
| Total assets acquired |
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284,213,000 |
[1] |
| Current liabilities |
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36,784,000 |
[1] |
| Total liabilities assumed |
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36,784,000 |
[1] |
| Net assets acquired |
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247,429,000 |
[1] |
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Measurement Period Adjustments | HealthTran
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| Business Acquisition, Purchase Price Allocation, Assets Acquired (Liabilities Assumed), Net [Abstract] |
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| Total current assets |
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245,000 |
[2] |
| Goodwill |
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833,000 |
[2] |
| Customer relationships intangible |
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(2,600,000) |
[2] |
| Total assets acquired |
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(1,522,000) |
[2] |
| Current liabilities |
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(496,000) |
[2] |
| Total liabilities assumed |
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(496,000) |
[2] |
| Net assets acquired |
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(1,026,000) |
[2] |
| Payments due to previous owners |
1,000,000 |
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Current Amounts Recognized at Acquisition Date | HealthTran
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| Business Acquisition, Purchase Price Allocation, Assets Acquired (Liabilities Assumed), Net [Abstract] |
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| Total current assets |
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30,899,000 |
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| Property and equipment |
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2,787,000 |
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| Goodwill |
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174,475,000 |
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| Customer relationships intangible |
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74,530,000 |
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| Total assets acquired |
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282,691,000 |
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| Current liabilities |
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36,288,000 |
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| Total liabilities assumed |
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36,288,000 |
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| Net assets acquired |
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246,403,000 |
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Trademarks/Trade names | HealthTran
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| Business Acquisition, Purchase Price Allocation, Assets Acquired (Liabilities Assumed), Net [Abstract] |
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| Customer relationships intangible |
1,750,000 |
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| Estimated useful life |
6 |
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Customer relationships | HealthTran
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| Business Acquisition, Purchase Price Allocation, Assets Acquired (Liabilities Assumed), Net [Abstract] |
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| Customer relationships intangible |
69,800,000 |
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Non-compete agreements | HealthTran
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| Business Acquisition, Purchase Price Allocation, Assets Acquired (Liabilities Assumed), Net [Abstract] |
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| Customer relationships intangible |
2,600,000 |
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| Estimated useful life |
5 |
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License | HealthTran
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| Business Acquisition, Purchase Price Allocation, Assets Acquired (Liabilities Assumed), Net [Abstract] |
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| Customer relationships intangible |
$ 380,000 |
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| Estimated useful life |
3 |
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Minimum | Customer relationships | HealthTran
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| Business Acquisition, Purchase Price Allocation, Assets Acquired (Liabilities Assumed), Net [Abstract] |
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| Estimated useful life |
4 |
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Maximum | Customer relationships | HealthTran
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| Business Acquisition, Purchase Price Allocation, Assets Acquired (Liabilities Assumed), Net [Abstract] |
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| Estimated useful life |
9 |
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