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Long-Term Debt and Credit Facility, Textuals (Details) (USD $) | 3 Months Ended |  |  | 1 Months Ended | 3 Months Ended |  |  |  |  |  |  | 3 Months Ended |  |  | 3 Months Ended
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Mar. 31, 2013 | Mar. 31, 2012 | Apr. 15, 2013 | Dec. 31, 2012 | Apr. 19, 2013 Convertible Notes | Mar. 31, 2013 Convertible Notes | Apr. 15, 2013 Convertible Notes | Mar. 29, 2010 Convertible Notes | Apr. 15, 2013 Call Options | Mar. 31, 2013 Call Options | Apr. 15, 2013 Warrant Transactions | Mar. 31, 2013 Warrant Transactions | Mar. 31, 2013 Senior Notes | May 23, 2012 Senior Notes | Mar. 31, 2013 Revolving Credit Facility | Mar. 31, 2013 Line of Credit | Mar. 31, 2013 Letter of Credit | Mar. 31, 2013 Minimum
Long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of notes | $ 225,000,000 |  |  | $ 225,000,000 |  |  |  | $ 175,000,000 |  |  |  |  |  | $ 225,000,000 |  |  |  |
Interest rate |  |  |  |  |  |  |  | 4.50% |  |  |  |  |  | 8.25% |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  | 4,800,000 |  |  |  |  |
Payment of quarterly cash dividends | $ 0.30 | $ 0.25 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.24
Conversion rate of common stock shares per $1,000 of principal amount |  |  |  |  | 20.7522 | 20.7309 |  |  |  |  |  |  |  |  |  |  |  |
Principal amount in conversion feature |  |  |  |  |  | 1,000 | 1,000 |  |  |  |  |  |  |  |  |  |  |
Conversion price per share of note | $ 48.24 |  | $ 48.19 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock sold related to option counterparties net share-settled warrants |  |  |  |  |  |  |  |  |  |  |  | 3,600,000 |  |  |  |  |  |
Exercise price per share of call options |  |  |  |  |  |  |  |  | $ 48.19 | $ 48.24 |  |  |  |  |  |  |  |
Exercise price per share of Warrants |  |  |  |  |  |  |  |  |  |  | 61.19 | 61.25 |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 300,000,000 |  |  |
Available borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 286,000,000 |  |  |
Outstanding line of credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 6,900,000 |
Remaining available borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 279,100,000 |  |  |
Interest on Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.00% |  |  |

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