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Long-Term Debt and Credit Facility, Textuals (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified | 3 Months Ended |  |  |  | 3 Months Ended |  |  | 3 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Mar. 31, 2014 Convertible Notes Days | Mar. 29, 2010 Convertible Notes | Mar. 31, 2014 Call Options | Mar. 31, 2014 Warrant Transactions | Mar. 31, 2013 Warrant Transactions | Mar. 31, 2014 Senior Notes | Mar. 31, 2013 Senior Notes | May 23, 2012 Senior Notes | Mar. 31, 2014 Revolving Credit Facility | Mar. 31, 2014 Line of Credit | Mar. 31, 2014 Letter of Credit | Mar. 31, 2014 Minimum
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assumptions, Expected Dividend Payments |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.24 | [1]
Long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of notes |  |  |  | $ 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 |  |  |  |  |  |
Payment of quarterly cash dividends | $ 0.35 | $ 0.30 |  |  |  |  |  |  |  |  |  |  |  | $ 0.24 |
Conversion rate of common stock shares per $1,000 of principal amount |  |  | 20.8234 |  |  |  |  |  |  |  |  |  |  |  |
Principal amount in conversion feature |  |  | 1,000 |  |  |  |  |  |  |  |  |  |  |  |
Conversion price per share of note |  |  | $ 48.02 |  |  |  |  |  |  |  |  |  |  |  |
Threshold percentage of stock price trigger for conversion |  |  | 130.00% |  |  |  |  |  |  |  |  |  |  |  |
Trading days threshold for conversion |  |  | 20 |  |  |  |  |  |  |  |  |  |  |  |
Consecutive trading days threshold for conversion |  |  | 30 days |  |  |  |  |  |  |  |  |  |  |  |
Common stock sold related to option counterparties net-share-settled warrants |  |  |  |  |  | 3.6 | 3.6 |  |  |  |  |  |  |  |
Exercise price per share of Call Options |  |  |  |  | $ 48.02 |  |  |  |  |  |  |  |  |  |
Exercise price per share of Warrants |  |  |  |  |  | 60.98 | 61.25 |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  | 300,000,000 |  |  |  |
Available borrowing capacity |  |  |  |  |  |  |  |  |  |  | 263,400,000 |  |  |  |
Outstanding line of credit |  |  |  |  |  |  |  |  |  |  |  | 0 | 7,000,000 |  |
Remaining available borrowing capacity |  |  |  |  |  |  |  |  |  |  | $ 256,400,000 |  |  |  |
Interest on Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  | 4.00% |  |  |  |
[1] | The quarterly dividend in the first quarter of 2014 was $0.35 per share, but the model assumes a discrete $0.24 per share quarterly dividend as was paid at the inception of the Call Options. Quarterly dividends in excess of $0.24 per share do not affect the Call Options’ value due to anti-dilution adjustments.

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