Short- and Long-Term Investments and Investments on Deposit for Licensure (Details 1) (USD $) In Thousands	Jun. 30, 2011
Amortized cost and fair value of available-for-sale debt securities by contractual maturity
Maturing within one year, amortized cost	$ 464,912
Maturing within one year, fair value	465,751
Maturing between one year and five years, amortized cost	515,855
Maturing between one year and five years, fair value	519,137
Maturing between five years and ten years, amortized cost	178,643
Maturing between five years and ten years, fair value	183,639
Maturing in greater than ten years, amortized cost	68,163
Maturing in greater than ten years, fair value	68,306
Total, amortized cost	1,227,573
Total, fair value	$ 1,236,833

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