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Debt and Credit Agreements (Details 2) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Debt Instrument [Line Items] |  |  |
Long-term Debt | $ 960,706,000 | $ 857,358,000 |
Less: current maturities | (3,278,000) | (3,558,000) |
Total Long-term Debt | 957,428,000 | 853,800,000 |
Cash payments for interest on all debt | 45,500,000 | 46,400,000 | 59,900,000
Maturities of Long-term Debt [Abstract] |  |  |
2014 | 14,770,000 |  |
2015 | 252,312,000 |  |
2016 | 1,357,000 |  |
2017 | 240,683,000 |  |
Senior notes | 5.75% notes due May 15, 2018 |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 5.75% | 5.75% |
Long-term Debt | 447,931,000 | 447,613,000 |
Redemption price as a percentage of principal amount of notes | 101.00% |  |
Senior notes | 5.125% notes due September 15, 2013 |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 5.125% | 5.125% |
Long-term Debt | 149,875,000 | 149,705,000 |
Senior notes | 2.7% notes due October 15, 2015 |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 2.70% | 2.70% |
Long-term Debt | 249,022,000 | 248,681,000 |
Redemption price as a percentage of principal amount of notes | 101.00% |  |
Other financing payable in varying amounts due principally through 2018 with a weighted-average interest rate of 2.7% and 9.4% at December 31, 2012 and 2011, respectively |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt | $ 113,878,000 | $ 11,359,000 |
Weighted average interest rate | 2.70% | 9.40% |
Line of credit |  |  |
Debt Instrument [Line Items] |  |  |
Maximum debt to capital ratio per covenant | 60.00% |  |
Maximum proportion of subsidiary consolidated indebtedness to consolidated tangible assets | 10.00% |  |
Minimum consolidated interest coverage ratio, numerator | 3 |  |
Minimum consolidated interest coverage ratio, denominator | 1 |  |

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