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Retirement and Benefit Plans Level 4 Deferred Compensation Plan (Details) (USD $)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Deferred Compensation Plans [Line Items]              
Interest expense $ 4,781,000 $ 4,818,000 $ 9,672,000 $ 9,631,000 $ 21,757,000 $ 18,987,000 $ 21,005,000
Deferred compensation liability         10,900,000 11,400,000  
Accrued liabilities Compensation and benefits [Member]
              
Deferred Compensation Plans [Line Items]              
Deferred compensation liability         1,100,000 1,000,000  
Other Compensation and benefits [Member]
              
Deferred Compensation Plans [Line Items]              
Deferred compensation liability         9,800,000 10,400,000  
Deferred Compensation Arrangement with Individual [Member]
              
Deferred Compensation Plans [Line Items]              
Interest expense         $ 600,000 $ 700,000 $ 800,000