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Long-Term Debt and Credit Facility, Textuals (Details) (USD $) | 3 Months Ended | 6 Months Ended |  | 0 Months Ended | 6 Months Ended |  |  |  |  |  |  | 3 Months Ended | 6 Months Ended |  |  | 3 Months Ended
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Jun. 30, 2013 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012 | Jul. 15, 2013 Convertible Notes | Jun. 30, 2013 Convertible Notes | Jun. 28, 2013 Convertible Notes | Mar. 29, 2010 Convertible Notes | Jul. 15, 2013 Call Options | Jun. 30, 2013 Call Options | Jul. 15, 2013 Warrant Transactions | Jun. 30, 2013 Warrant Transactions | Jun. 30, 2013 Senior Notes | Jun. 30, 2012 Senior Notes | Jun. 30, 2013 Senior Notes | Jun. 30, 2012 Senior Notes | May 23, 2012 Senior Notes | Jun. 30, 2013 Revolving Credit Facility | Jun. 30, 2013 Line of Credit | Jun. 30, 2013 Letter of Credit | Jun. 30, 2013 Minimum
Long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of notes | $ 225,000,000 | $ 225,000,000 |  | $ 225,000,000 |  |  |  | $ 175,000,000 |  |  |  |  |  |  |  |  | $ 225,000,000 |  |  |  |
Interest rate |  |  |  |  |  |  |  | 4.50% |  |  |  |  |  |  |  |  | 8.25% |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  | 4,800,000 | 2,100,000 | 9,600,000 | 2,100,000 |  |  |  |  |
Payment of quarterly cash dividends | $ 0.30 | $ 0.60 | $ 0.50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.24
Conversion rate of common stock shares per $1,000 of principal amount |  |  |  |  | 20.7714 | 20.7522 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount in conversion feature |  |  |  |  | 1,000 | 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price per share of note |  |  |  |  | $ 48.14 | $ 48.19 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion percentage threshold of stock price over conversion price |  |  |  |  |  |  | 130.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of trading days within 30 consecutive trading days |  |  |  |  |  |  | 20 days |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of consecutive trading days |  |  |  |  |  |  | 30 days |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock sold related to option counterparties net-share-settled warrants |  |  |  |  |  |  |  |  |  |  |  | 3,600,000 |  |  |  |  |  |  |  |  |
Exercise price per share of Call Options |  |  |  |  |  |  |  |  | $ 48.14 | $ 48.19 |  |  |  |  |  |  |  |  |  |  |
Exercise price per share of Warrants |  |  |  |  |  |  |  |  |  |  | 61.14 | 61.19 |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 300,000,000 |  |  |
Available borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 266,400,000 |  |  |
Outstanding line of credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 7,000,000 |
Remaining available borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 259,400,000 |  |  |
Interest on Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.00% |  |  |

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