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Subsequent Events (Details Textual) (USD $) | 6 Months Ended |  | 6 Months Ended |  |  |  | 3 Months Ended |
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Jun. 30, 2012 | Jun. 30, 2012 Maximum [Member] Rate | Jun. 30, 2012 Minimum [Member] Rate | Jun. 30, 2012 Senior Subordinated Notes [Member] | Jul. 02, 2012 Senior Subordinated Notes [Member] | Oct. 23, 2012 5.0 % Convertible Notes [Member] | Jul. 02, 2012 5.0 % Convertible Notes [Member] | Jun. 30, 2012 Exchange Offer for 5.0% Convertible Notes [Member] | Jun. 25, 2012 Exchange Offer for 5.0% Convertible Notes [Member] | Jun. 25, 2012 Exchange Offer for 5.0% Convertible Notes [Member] Maximum [Member] | Jun. 25, 2012 Exchange Offer for 5.0% Convertible Notes [Member] Minimum [Member]
Subsequent Events (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  | $ 200,000,000 | $ 80,000,000 |  |  | $ 1,000 |  |
Notes maturity date |  |  |  | Jul. 15, 2022 |  |  |  |  |  |  |
Notes issued at a price of principal amount |  |  |  | 99.11% |  |  |  |  |  |  |
Notes issued yield maturity, percentage |  |  |  | 7.125% |  |  |  |  |  |  |
Interest on notes |  | 10.52% | 9.52% |  | 7.00% |  | 5.00% |  |  |  |
Date of first required payment |  |  |  | Jan. 15, 2013 |  |  |  |  |  |  |
Interest payable description |  |  |  | Semi-annually in arrears on January 15 and July 15 of each year |  |  |  |  |  |  |
Percentage of notes redeemable under special mandatory redemption |  |  |  | 100.00% |  |  |  |  |  |  |
Notes redeemed percentage of aggregate principal amount |  |  |  | 35.00% |  |  |  |  |  |  |
Notes redemption price percentage of the par value |  |  |  | 107.00% |  |  |  |  |  |  |
Notes redemption price percentage of the par value due to change of control |  |  |  | 101.00% |  |  |  |  |  |  |
Debt instrument maximum allowed dividends per share |  |  |  | $ 0.10 |  |  |  |  |  |  |
Outstanding principal amount of the 7.0% Notes | 25.00% |  |  |  |  |  |  |  |  |  |
Indebtedness with outstanding balance |  |  |  | 35,000,000 |  |  |  |  |  |  |
Total value of offer consideration for $ 1,000 principal amount |  |  |  |  |  |  |  |  |  | 1,631 | 1,000
Exchange offer expires |  |  |  |  |  |  |  | 12:00 midnight New York City time at the end of July 27, 2012 |  |  |
Additional stock authorized used in the repurchase program | $ 100,000,000 |  |  |  |  |  |  |  |  |  |

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