Investments Other Comprehensive Income (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2012
Available for Sale Securities, Noncurrent [Member]
Dec. 31, 2011
Available for Sale Securities, Noncurrent [Member]
Dec. 31, 2012
Available for Sale Securities, Noncurrent [Member]
Computer Software and Services [Member]
Dec. 31, 2011
Available for Sale Securities, Noncurrent [Member]
Computer Software and Services [Member]
Dec. 31, 2012
Available for Sale Securities, Noncurrent [Member]
Aerospace/Defense [Member]
Dec. 31, 2011
Available for Sale Securities, Noncurrent [Member]
Aerospace/Defense [Member]
Dec. 31, 2012
Available for Sale Securities, Noncurrent [Member]
Manufacturing [Member]
Dec. 31, 2011
Available for Sale Securities, Noncurrent [Member]
Manufacturing [Member]
Dec. 31, 2012
Available for Sale Securities, Noncurrent [Member]
Restaurants [Member]
Dec. 31, 2011
Available for Sale Securities, Noncurrent [Member]
Restaurants [Member]
Dec. 31, 2012
Available for Sale Securities, Noncurrent [Member]
Other Industry [Member]
Dec. 31, 2011
Available for Sale Securities, Noncurrent [Member]
Other Industry [Member]
Schedule of Available-for-sale Securities [Line Items]                          
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities $ 829                        
Cost   81,551 82,464 4,447 27,649 11,675 10,746 16,278 16,495 5,974 5,974 43,177 21,600
Gross Unrealized Losses   47,478 (41,120) 4 (3,132) 26,581 (10,884) 11,754 (14,960) 9,038 (3,390) 101 (8,754)
Gross Unrealized Gains   (8,201) (3,005) (627) (2,146) 0 0 0 0 0 0 (7,574) (859)
Fair value   $ 120,828 $ 120,579 $ 3,824 [1],[2] $ 28,635 [1],[2] $ 38,256 [1],[2] $ 21,630 [1],[2] $ 28,032 [1],[2] $ 31,455 [1],[2] $ 15,012 [1],[2] $ 9,364 [1],[2] $ 35,704 [1],[2] $ 29,495 [1],[2]
[1] Level 2 investment. Equity securities totaling $41,476 and $32,672 were classified as Level 2 investments as of December 31, 2012 and 2011, respectively.
[2] Level 1 investment. Equity securities totaling $79,352 and $87,907 were classified as Level 1 investments as of December 31, 2012 and 2011, respectively.