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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

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- Definition The carrying amount of the liability as of the balance sheet date to an individual under a deferred compensation arrangement. This amount may be the result of periodic accruals made over the period of active employment, or reflect termination benefits resulting contractual terms or a death benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 30 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363 + Details
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- Definition Amount of the cost of borrowed funds accounted for as interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.9) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 9 -Article 9 + Details
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