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Long-Term Debt and Credit Facility, Textuals (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified | 9 Months Ended |  | 3 Months Ended | 9 Months Ended |  |  |  | 3 Months Ended | 9 Months Ended |  |  | 3 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013 | Sep. 30, 2014 Convertible Notes Days | Sep. 30, 2014 Convertible Notes | Mar. 29, 2010 Convertible Notes | Sep. 30, 2014 Call Options | Sep. 30, 2014 Warrant Transactions | Sep. 30, 2013 Warrant Transactions | Sep. 30, 2014 Senior Notes | Sep. 30, 2013 Senior Notes | Sep. 30, 2014 Senior Notes | Sep. 30, 2013 Senior Notes | May 23, 2012 Senior Notes | Sep. 30, 2014 Revolving Credit Facility | Sep. 30, 2014 Line of Credit | Sep. 30, 2014 Letter of Credit | Sep. 30, 2014 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 including amortization of deferred financing costs |  |  |  |  |  |  |  |  |  | 4,800,000 | 4,800,000 | 14,500,000 | 14,500,000 |  |  |  |  |
Payment of quarterly cash dividends | $ 1.05 | $ 0.90 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.24
Conversion rate of common stock shares per $1,000 of principal amount |  |  |  |  | 20.8862 |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount in conversion feature |  |  |  | 1,000 | 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price per share of note |  |  |  | $ 47.88 | $ 47.88 |  |  |  |  |  |  |  |  |  |  |  |  |
Threshold percentage of stock price trigger for conversion |  |  |  | 130.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trading days threshold for conversion |  |  |  | 20 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consecutive trading days threshold for conversion |  |  |  | 30 days |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trading days warrants are exercisable | 120 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock sold related to option counterparties net-share-settled warrants |  |  |  |  |  |  |  | 3.7 | 3.6 |  |  |  |  |  |  |  |  |
Exercise price per share of Call Options |  |  |  |  |  |  | $ 47.88 |  |  |  |  |  |  |  |  |  |  |
Exercise price per share of Warrants |  |  |  |  |  |  |  | 60.80 | 61.14 |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 300,000,000 |  |  |
Available borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 271,000,000 |  |  |
Outstanding line of credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | (7,700,000) |
Remaining available borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 263,300,000 |  |  |
Interest on Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.00% |  |  |

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