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Level 4 Retirement and Benefit Plans (Details) (USD $)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2013
Mar. 31, 2013
Jun. 30, 2012
Dec. 31, 2013
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Net periodic benefit cost [Abstract]                  
Service cost $ 671,000   $ 1,182,000   $ 1,342,000 $ 2,351,000 $ 4,762,000 $ 5,112,000 $ 4,931,000
Interest cost 4,650,000   4,824,000   9,292,000 9,667,000 19,234,000 20,484,000 20,258,000
Expected return on plan assets (4,916,000)   (4,847,000)   (9,782,000) (9,691,000) (19,390,000) (17,910,000) (18,474,000)
Amortization of actuarial loss 2,281,000   1,958,000   4,537,000 3,984,000 7,632,000 2,703,000 556,000
Amortization of prior service costs 22,000   42,000   45,000 83,000 165,000 175,000 178,000
Net periodic benefit cost 2,708,000   3,159,000   5,434,000 6,394,000 12,653,000 11,368,000 7,449,000
Pension contributions [Abstract]                  
Pension contributions   9,300,000     9,970,000 7,874,000 8,486,000 13,621,000 3,873,000
Estimated remaining 2013 contributions       $ 1,000,000