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Defined Benfit Plan (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Jun. 30, 2012
Level 1 [Member]
Dec. 31, 2011
Level 1 [Member]
Jun. 30, 2012
Level 2 [Member]
Dec. 31, 2011
Level 2 [Member]
Jun. 30, 2012
Level 3 [Member]
Dec. 31, 2011
Level 3 [Member]
Jun. 30, 2012
Equity Securities [Member]
Dec. 31, 2011
Equity Securities [Member]
Jun. 30, 2012
Fixed Income Securities [Member]
Dec. 31, 2011
Fixed Income Securities [Member]
Jun. 30, 2012
Cash and cash equivalents [Member]
Dec. 31, 2011
Cash and cash equivalents [Member]
Jun. 30, 2012
Cash and cash equivalents [Member]
Level 1 [Member]
Dec. 31, 2011
Cash and cash equivalents [Member]
Level 1 [Member]
Jun. 30, 2012
Cash and cash equivalents [Member]
Level 2 [Member]
Dec. 31, 2011
Cash and cash equivalents [Member]
Level 2 [Member]
Jun. 30, 2012
Cash and cash equivalents [Member]
Level 3 [Member]
Dec. 31, 2011
Cash and cash equivalents [Member]
Level 3 [Member]
Jun. 30, 2012
Actively Managed [Member]
U.S. Small Cap Equity [Member]
Dec. 31, 2011
Actively Managed [Member]
U.S. Small Cap Equity [Member]
Jun. 30, 2012
Actively Managed [Member]
U.S. Small Cap Equity [Member]
Level 1 [Member]
Dec. 31, 2011
Actively Managed [Member]
U.S. Small Cap Equity [Member]
Level 1 [Member]
Jun. 30, 2012
Actively Managed [Member]
U.S. Small Cap Equity [Member]
Level 2 [Member]
Dec. 31, 2011
Actively Managed [Member]
U.S. Small Cap Equity [Member]
Level 2 [Member]
Jun. 30, 2012
Actively Managed [Member]
U.S. Small Cap Equity [Member]
Level 3 [Member]
Dec. 31, 2011
Actively Managed [Member]
U.S. Small Cap Equity [Member]
Level 3 [Member]
Jun. 30, 2012
Actively Managed [Member]
U.S. Large Cap Equity [Member]
Dec. 31, 2011
Actively Managed [Member]
U.S. Large Cap Equity [Member]
Jun. 30, 2012
Actively Managed [Member]
U.S. Large Cap Equity [Member]
Level 1 [Member]
Dec. 31, 2011
Actively Managed [Member]
U.S. Large Cap Equity [Member]
Level 1 [Member]
Jun. 30, 2012
Actively Managed [Member]
U.S. Large Cap Equity [Member]
Level 2 [Member]
Dec. 31, 2011
Actively Managed [Member]
U.S. Large Cap Equity [Member]
Level 2 [Member]
Jun. 30, 2012
Actively Managed [Member]
U.S. Large Cap Equity [Member]
Level 3 [Member]
Dec. 31, 2011
Actively Managed [Member]
U.S. Large Cap Equity [Member]
Level 3 [Member]
Jun. 30, 2012
Actively Managed [Member]
Emerging Market Equity [Member]
Dec. 31, 2011
Actively Managed [Member]
Emerging Market Equity [Member]
Jun. 30, 2012
Actively Managed [Member]
Emerging Market Equity [Member]
Level 1 [Member]
Dec. 31, 2011
Actively Managed [Member]
Emerging Market Equity [Member]
Level 1 [Member]
Jun. 30, 2012
Actively Managed [Member]
Emerging Market Equity [Member]
Level 2 [Member]
Dec. 31, 2011
Actively Managed [Member]
Emerging Market Equity [Member]
Level 2 [Member]
Jun. 30, 2012
Actively Managed [Member]
Emerging Market Equity [Member]
Level 3 [Member]
Dec. 31, 2011
Actively Managed [Member]
Emerging Market Equity [Member]
Level 3 [Member]
Jun. 30, 2012
Actively Managed [Member]
U.S. Small Mid Cap Equity [Member]
Dec. 31, 2011
Actively Managed [Member]
U.S. Small Mid Cap Equity [Member]
Jun. 30, 2012
Actively Managed [Member]
U.S. Small Mid Cap Equity [Member]
Level 1 [Member]
Dec. 31, 2011
Actively Managed [Member]
U.S. Small Mid Cap Equity [Member]
Level 1 [Member]
Jun. 30, 2012
Actively Managed [Member]
U.S. Small Mid Cap Equity [Member]
Level 2 [Member]
Dec. 31, 2011
Actively Managed [Member]
U.S. Small Mid Cap Equity [Member]
Level 2 [Member]
Jun. 30, 2012
Actively Managed [Member]
U.S. Small Mid Cap Equity [Member]
Level 3 [Member]
Dec. 31, 2011
Actively Managed [Member]
U.S. Small Mid Cap Equity [Member]
Level 3 [Member]
Jun. 30, 2012
Actively Managed [Member]
Non-U.S. Large Cap Equity [Member]
Dec. 31, 2011
Actively Managed [Member]
Non-U.S. Large Cap Equity [Member]
Jun. 30, 2012
Actively Managed [Member]
Non-U.S. Large Cap Equity [Member]
Level 1 [Member]
Dec. 31, 2011
Actively Managed [Member]
Non-U.S. Large Cap Equity [Member]
Level 1 [Member]
Jun. 30, 2012
Actively Managed [Member]
Non-U.S. Large Cap Equity [Member]
Level 2 [Member]
Dec. 31, 2011
Actively Managed [Member]
Non-U.S. Large Cap Equity [Member]
Level 2 [Member]
Jun. 30, 2012
Actively Managed [Member]
Non-U.S. Large Cap Equity [Member]
Level 3 [Member]
Dec. 31, 2011
Actively Managed [Member]
Non-U.S. Large Cap Equity [Member]
Level 3 [Member]
Jun. 30, 2012
Passive Index Fund ETFs [Member]
U.S. Small Cap Equity [Member]
Dec. 31, 2011
Passive Index Fund ETFs [Member]
U.S. Small Cap Equity [Member]
Jun. 30, 2012
Passive Index Fund ETFs [Member]
U.S. Small Cap Equity [Member]
Level 1 [Member]
Dec. 31, 2011
Passive Index Fund ETFs [Member]
U.S. Small Cap Equity [Member]
Level 1 [Member]
Jun. 30, 2012
Passive Index Fund ETFs [Member]
U.S. Small Cap Equity [Member]
Level 2 [Member]
Dec. 31, 2011
Passive Index Fund ETFs [Member]
U.S. Small Cap Equity [Member]
Level 2 [Member]
Jun. 30, 2012
Passive Index Fund ETFs [Member]
U.S. Small Cap Equity [Member]
Level 3 [Member]
Dec. 31, 2011
Passive Index Fund ETFs [Member]
U.S. Small Cap Equity [Member]
Level 3 [Member]
Jun. 30, 2012
Passive Index Fund ETFs [Member]
U.S. Large Cap Equity [Member]
Dec. 31, 2011
Passive Index Fund ETFs [Member]
U.S. Large Cap Equity [Member]
Jun. 30, 2012
Passive Index Fund ETFs [Member]
U.S. Large Cap Equity [Member]
Level 1 [Member]
Dec. 31, 2011
Passive Index Fund ETFs [Member]
U.S. Large Cap Equity [Member]
Level 1 [Member]
Jun. 30, 2012
Passive Index Fund ETFs [Member]
U.S. Large Cap Equity [Member]
Level 2 [Member]
Dec. 31, 2011
Passive Index Fund ETFs [Member]
U.S. Large Cap Equity [Member]
Level 2 [Member]
Jun. 30, 2012
Passive Index Fund ETFs [Member]
U.S. Large Cap Equity [Member]
Level 3 [Member]
Dec. 31, 2011
Passive Index Fund ETFs [Member]
U.S. Large Cap Equity [Member]
Level 3 [Member]
Jun. 30, 2012
Passive Index Fund ETFs [Member]
U.S. Small Mid Cap Equity [Member]
Dec. 31, 2011
Passive Index Fund ETFs [Member]
U.S. Small Mid Cap Equity [Member]
Jun. 30, 2012
Passive Index Fund ETFs [Member]
U.S. Small Mid Cap Equity [Member]
Level 1 [Member]
Dec. 31, 2011
Passive Index Fund ETFs [Member]
U.S. Small Mid Cap Equity [Member]
Level 1 [Member]
Jun. 30, 2012
Passive Index Fund ETFs [Member]
U.S. Small Mid Cap Equity [Member]
Level 2 [Member]
Dec. 31, 2011
Passive Index Fund ETFs [Member]
U.S. Small Mid Cap Equity [Member]
Level 2 [Member]
Jun. 30, 2012
Passive Index Fund ETFs [Member]
U.S. Small Mid Cap Equity [Member]
Level 3 [Member]
Dec. 31, 2011
Passive Index Fund ETFs [Member]
U.S. Small Mid Cap Equity [Member]
Level 3 [Member]
Jun. 30, 2012
Passive Index Fund ETFs [Member]
Non-U.S. Large Cap Equity [Member]
Dec. 31, 2011
Passive Index Fund ETFs [Member]
Non-U.S. Large Cap Equity [Member]
Jun. 30, 2012
Passive Index Fund ETFs [Member]
Non-U.S. Large Cap Equity [Member]
Level 1 [Member]
Dec. 31, 2011
Passive Index Fund ETFs [Member]
Non-U.S. Large Cap Equity [Member]
Level 1 [Member]
Jun. 30, 2012
Passive Index Fund ETFs [Member]
Non-U.S. Large Cap Equity [Member]
Level 2 [Member]
Dec. 31, 2011
Passive Index Fund ETFs [Member]
Non-U.S. Large Cap Equity [Member]
Level 2 [Member]
Jun. 30, 2012
Passive Index Fund ETFs [Member]
Non-U.S. Large Cap Equity [Member]
Level 3 [Member]
Dec. 31, 2011
Passive Index Fund ETFs [Member]
Non-U.S. Large Cap Equity [Member]
Level 3 [Member]
Jun. 30, 2012
Passive Index Fund ETFs [Member]
U.S. Mid Cap Equity [Member]
Dec. 31, 2011
Passive Index Fund ETFs [Member]
U.S. Mid Cap Equity [Member]
Jun. 30, 2012
Passive Index Fund ETFs [Member]
U.S. Mid Cap Equity [Member]
Level 1 [Member]
Dec. 31, 2011
Passive Index Fund ETFs [Member]
U.S. Mid Cap Equity [Member]
Level 1 [Member]
Jun. 30, 2012
Passive Index Fund ETFs [Member]
U.S. Mid Cap Equity [Member]
Level 2 [Member]
Dec. 31, 2011
Passive Index Fund ETFs [Member]
U.S. Mid Cap Equity [Member]
Level 2 [Member]
Jun. 30, 2012
Passive Index Fund ETFs [Member]
U.S. Mid Cap Equity [Member]
Level 3 [Member]
Dec. 31, 2011
Passive Index Fund ETFs [Member]
U.S. Mid Cap Equity [Member]
Level 3 [Member]
Jun. 30, 2012
Passive Index Fund ETFs [Member]
REIT [Member]
Dec. 31, 2011
Passive Index Fund ETFs [Member]
REIT [Member]
Jun. 30, 2012
Passive Index Fund ETFs [Member]
REIT [Member]
Level 1 [Member]
Dec. 31, 2011
Passive Index Fund ETFs [Member]
REIT [Member]
Level 1 [Member]
Jun. 30, 2012
Passive Index Fund ETFs [Member]
REIT [Member]
Level 2 [Member]
Dec. 31, 2011
Passive Index Fund ETFs [Member]
REIT [Member]
Level 2 [Member]
Jun. 30, 2012
Passive Index Fund ETFs [Member]
REIT [Member]
Level 3 [Member]
Dec. 31, 2011
Passive Index Fund ETFs [Member]
REIT [Member]
Level 3 [Member]
Jun. 30, 2012
Fixed Income [Member]
Dec. 31, 2011
Fixed Income [Member]
Jun. 30, 2012
Fixed Income [Member]
Level 1 [Member]
Dec. 31, 2011
Fixed Income [Member]
Level 1 [Member]
Jun. 30, 2012
Fixed Income [Member]
Level 2 [Member]
Dec. 31, 2011
Fixed Income [Member]
Level 2 [Member]
Jun. 30, 2012
Fixed Income [Member]
Level 3 [Member]
Dec. 31, 2011
Fixed Income [Member]
Level 3 [Member]
Components of Net Periodic Benefit Cost [Abstract]                                                                                                                                                                                                                                              
Service cost $ 1,157 $ 947 $ 2,314 $ 1,895                                                                                                                                                                                                                                      
Interest cost 1,450 1,445 2,901 2,890                                                                                                                                                                                                                                      
Other cost 1,166 738 2,332 1,473                                                                                                                                                                                                                                      
Expected return on assets (1,148) (1,105) (2,297) (2,209)                                                                                                                                                                                                                                      
Net periodic benefit cost 2,625 2,025 5,250 4,049                                                                                                                                                                                                                                      
Plan Assets [Abstract]                                                                                                                                                                                                                                              
Fair value of plan assets 69,466   69,466   65,084 35,922 34,662 33,544 30,422 0 0         1,836 4,301 1,836 4,301 0 0 0 0 6,785 [1] 6,303 [1] 6,785 [1] 6,303 [1] 0 [1] 0 [1] 0 [1] 0 [1] 4,068 [1] 3,716 [1] 4,068 [1] 3,716 [1] 0 [1] 0 [1] 0 [1] 0 [1] 4,162 [1] 3,547 [1] 4,162 [1] 3,547 [1] 0 [1] 0 [1] 0 [1] 0 [1] 2,000 [1] 1,814 [1] 2,000 [1] 1,814 [1] 0 [1] 0 [1] 0 [1] 0 [1] 4,963 [1] 4,271 [1] 4,963 [1] 4,271 [1] 0 [1] 0 [1] 0 [1] 0 [1] 136 [2] 143 [2] 136 [2] 143 [2] 0 [2] 0 [2] 0 [2] 0 [2] 6,090 [2] 5,525 [2] 6,090 [2] 5,525 [2] 0 [2] 0 [2] 0 [2] 0 [2] 681 [2] 617 [2] 681 [2] 617 [2] 0 [2] 0 [2] 0 [2] 0 [2] 5,135 [2] 4,356 [2] 5,135 [2] 4,356 [2] 0 [2] 0 [2] 0 [2] 0 [2] 66 [2] 69 [2] 66 [2] 69 [2] 0 [2] 0 [2] 0 [2] 0 [2] 3,460 [2] 3,213 [2] 0 [2] 0 [2] 3,460 [2] 3,213 [2] 0 [2] 0 [2] 30,084 [3] 27,209 [3] 0 [3] 0 [3] 30,084 [3] 27,209 [3] 0 [3] 0 [3]
Target plan asset alocations                       55.00% 55.00% 45.00% 45.00%                                                                                                                                                                                                                
Employer Contributions [Abstract]                                                                                                                                                                                                                                              
Estimated employer contributions for the current fiscal year 10,500   10,500                                                                                                                                                                                                                                        
Actual employer contribution amount in current period $ 1,344   $ 2,394                                                                                                                                                                                                                                        
[1] Actively managed portfolio of securities with the goal to exceed the stated benchmark performance.
[2] Open-ended fund of securities with the goal to track the stated benchmark performance.
[3] Actively managed portfolio of fixed income securities with the goal to exceed the Barclays Capital Aggregate Bond, Barclays Capital 1-3 Year Government/Credit, Citigroup World Government Bond Index, and Merrill Lynch High Yield Master II performance.