XML 25 R27.htm IDEA: XBRL DOCUMENT v2.4.0.8
Summary of Significant Accounting Policies Investments in Marketable Securities (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis $ 171,881 $ 90,648
Available-for-sale Securities, Gross Unrealized Gains 31 20
Available-for-sale Securities, Gross Unrealized Losses (696) (1,193)
Available-for-sale Securities, Fair Value Disclosure 171,216 89,475
US Government Debt Securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 171,881 [1] 87,394
Available-for-sale Securities, Gross Unrealized Gains 31 [1] 20
Available-for-sale Securities, Gross Unrealized Losses (696) [1] (411)
Available-for-sale Securities, Fair Value Disclosure 171,216 [1] 87,003
Equity Securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis   3,254
Available-for-sale Securities, Gross Unrealized Gains   0
Available-for-sale Securities, Gross Unrealized Losses   (782)
Available-for-sale Securities, Fair Value Disclosure   $ 2,472
[1] (1) Maturity dates ranging from 2013 to 2014.