XML 34 R31.htm IDEA: XBRL DOCUMENT v2.3.0.15
Investments (Gross Unrealized Losses And Fair Value Of Investments With Unrealized Losses) (Details) (USD $)
In Thousands
Dec. 31, 2010
Loss Position for Less Than Twelve Months, Fair Value$ 268,423
Loss Position for Less Than Twelve Months, Unrealized Losses(1,089)
Loss Position for Greater Than Twelve Months, Fair Value1,536
Loss Position for Greater Than Twelve Months, Unrealized Losses(1)
Total, Fair Value269,959
Total, Unrealized Losses(1,090)
Asset-Backed Securities [Member] | Marketable Securities [Member]
 
Loss Position for Less Than Twelve Months, Fair Value3,286
Loss Position for Less Than Twelve Months, Unrealized Losses 
Loss Position for Greater Than Twelve Months, Fair Value 
Loss Position for Greater Than Twelve Months, Unrealized Losses 
Total, Fair Value3,286
Total, Unrealized Losses 
Asset-Backed Securities [Member] | Marketable Securities, Non-Current [Member]
 
Loss Position for Less Than Twelve Months, Fair Value8,400
Loss Position for Less Than Twelve Months, Unrealized Losses(2)
Loss Position for Greater Than Twelve Months, Fair Value 
Loss Position for Greater Than Twelve Months, Unrealized Losses 
Total, Fair Value8,400
Total, Unrealized Losses(2)
Residential Mortgage-Backed Securities [Member] | Marketable Securities [Member]
 
Loss Position for Less Than Twelve Months, Fair Value54,718
Loss Position for Less Than Twelve Months, Unrealized Losses(13)
Loss Position for Greater Than Twelve Months, Fair Value 
Loss Position for Greater Than Twelve Months, Unrealized Losses 
Total, Fair Value54,718
Total, Unrealized Losses(13)
Residential Mortgage-Backed Securities [Member] | Marketable Securities, Non-Current [Member]
 
Loss Position for Less Than Twelve Months, Fair Value80,746
Loss Position for Less Than Twelve Months, Unrealized Losses(20)
Loss Position for Greater Than Twelve Months, Fair Value 
Loss Position for Greater Than Twelve Months, Unrealized Losses 
Total, Fair Value80,746
Total, Unrealized Losses(20)
Corporate Debt Securities [Member] | Marketable Securities [Member]
 
Loss Position for Less Than Twelve Months, Fair Value35,432
Loss Position for Less Than Twelve Months, Unrealized Losses(18)
Loss Position for Greater Than Twelve Months, Fair Value1,536
Loss Position for Greater Than Twelve Months, Unrealized Losses(1)
Total, Fair Value36,968
Total, Unrealized Losses(19)
Corporate Debt Securities [Member] | Marketable Securities, Non-Current [Member]
 
Loss Position for Less Than Twelve Months, Fair Value56,992
Loss Position for Less Than Twelve Months, Unrealized Losses(881)
Loss Position for Greater Than Twelve Months, Fair Value 
Loss Position for Greater Than Twelve Months, Unrealized Losses 
Total, Fair Value56,992
Total, Unrealized Losses(881)
Corporate Debt Securities [Member] | Restricted Investments [Member]
 
Loss Position for Less Than Twelve Months, Fair Value7,110
Loss Position for Less Than Twelve Months, Unrealized Losses(29)
Loss Position for Greater Than Twelve Months, Fair Value 
Loss Position for Greater Than Twelve Months, Unrealized Losses 
Total, Fair Value7,110
Total, Unrealized Losses(29)
Government-Sponsored Enterprise Securities [Member] | Marketable Securities, Non-Current [Member]
 
Loss Position for Less Than Twelve Months, Fair Value20,237
Loss Position for Less Than Twelve Months, Unrealized Losses(120)
Loss Position for Greater Than Twelve Months, Fair Value 
Loss Position for Greater Than Twelve Months, Unrealized Losses 
Total, Fair Value20,237
Total, Unrealized Losses(120)
Government-Sponsored Enterprise Securities [Member] | Restricted Investments [Member]
 
Loss Position for Less Than Twelve Months, Fair Value1,502
Loss Position for Less Than Twelve Months, Unrealized Losses(6)
Loss Position for Greater Than Twelve Months, Fair Value 
Loss Position for Greater Than Twelve Months, Unrealized Losses 
Total, Fair Value1,502
Total, Unrealized Losses(6)
Marketable Securities [Member]
 
Loss Position for Less Than Twelve Months, Fair Value93,436
Loss Position for Less Than Twelve Months, Unrealized Losses(31)
Loss Position for Greater Than Twelve Months, Fair Value1,536
Loss Position for Greater Than Twelve Months, Unrealized Losses(1)
Total, Fair Value94,972
Total, Unrealized Losses(32)
Marketable Securities, Non-Current [Member]
 
Loss Position for Less Than Twelve Months, Fair Value166,375
Loss Position for Less Than Twelve Months, Unrealized Losses(1,023)
Loss Position for Greater Than Twelve Months, Fair Value 
Loss Position for Greater Than Twelve Months, Unrealized Losses 
Total, Fair Value166,375
Total, Unrealized Losses(1,023)
Restricted Investments [Member]
 
Loss Position for Less Than Twelve Months, Fair Value8,612
Loss Position for Less Than Twelve Months, Unrealized Losses(35)
Loss Position for Greater Than Twelve Months, Fair Value 
Loss Position for Greater Than Twelve Months, Unrealized Losses 
Total, Fair Value8,612
Total, Unrealized Losses$ (35)