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Acquisitions (Details Textual) (USD $)
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3 Months Ended | 6 Months Ended | 0 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended | 0 Months Ended | |||
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Jun. 30, 2013
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Jun. 30, 2012
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Jun. 30, 2013
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Jun. 30, 2012
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Jan. 02, 2013
Medmarc [Member]
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Jun. 30, 2013
Medmarc [Member]
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Jun. 30, 2013
Medmarc [Member]
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Dec. 31, 2012
Medmarc [Member]
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Dec. 27, 2012
Medmarc [Member]
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Jan. 02, 2013
Noncompete Agreements [Member]
Medmarc [Member]
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| Acquisitions (Textual) [Abstract] | ||||||||||
| Business acquisition cash paid | $ 153,700,000 | |||||||||
| Funding of future policy credits for eligible members | 7,500,000 | |||||||||
| Expenses related to the purchase of business | 2,000,000 | 1,000,000 | ||||||||
| Gain on acquisition | 0 | 0 | 35,492,000 | 0 | 35,492,000 | |||||
| Finite-Lived Intangible Asset, Useful Life | 2 years | |||||||||
| Profit Margin Used in Determining Underlying Net Cash Flows for Fair Value of Acquired Assets/Liabilities | 5.00% | |||||||||
| Risk Premium Used in Determining Underlying Net Cash Flows for Fair Value of Acquired Assets/Liabilities | 5.00% | |||||||||
| Revenue since acquisition date | 9,900,000 | 22,800,000 | ||||||||
| Earnings since acquisition date | 1,300,000 | 4,500,000 | ||||||||
| Third party conversion agent asset | $ 153,700,000 | |||||||||