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Convertible Notes, Long-Term Debt and Credit Facility (Additional Disclosures) (Details) (USD $) | 0 Months Ended | 1 Months Ended | 12 Months Ended |  |  | 0 Months Ended | 1 Months Ended | 12 Months Ended | 0 Months Ended | 1 Months Ended | 12 Months Ended |  | 0 Months Ended | 12 Months Ended |  | 12 Months Ended |  | 0 Months Ended
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Mar. 31, 2010 | Feb. 14, 2008 | Jun. 30, 2012 | Nov. 30, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Feb. 29, 2008 | Feb. 11, 2008 | Mar. 31, 2010 Term loan [Member] | Jun. 30, 2011 Term loan [Member] | Dec. 31, 2012 Term loan [Member] | Dec. 31, 2012 2008 Notes [Member] | Jun. 25, 2012 2008 Notes [Member] | Feb. 14, 2008 2008 Notes [Member] | May 31, 2011 2008 Notes [Member] | Dec. 31, 2012 2008 Notes [Member] | Mar. 31, 2010 2008 Notes [Member] | Mar. 31, 2010 Senior credit facility [Member] | Jan. 05, 2012 2010 Notes [Member] | Dec. 31, 2012 2010 Notes [Member] | Mar. 31, 2010 2010 Notes [Member] | Dec. 31, 2012 Exchange agreement [Member] | Mar. 31, 2010 Exchange agreement [Member] | Mar. 31, 2010 Convertible Note [Member] | Mar. 31, 2010 Annual interest rate 12.5% [Member] Term loan [Member]
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 115,000,000 |  |  |  |  |  |  |  |  |  |  |
Term loan, face amount |  |  |  |  |  |  |  |  |  | 40,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible notes, interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.25% |  |  |  |  |  | 5.25% |  |  |  |  |
Convertible notes maturity date |  |  |  |  |  |  |  |  |  | Nov. 01, 2012 |  |  |  |  | Feb. 15, 2028 |  |  |  |  |  | Feb. 15, 2028 |  |  |  |  |
Nonconvertible debt borrowing interest rate |  |  |  |  |  |  |  |  |  |  |  |  | 11.50% |  |  |  | 11.50% |  |  |  |  |  |  |  |  |
Expected term for accretion of associated debt discount (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |
Contractual call/put options, exercisable date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Feb. 15, 2013 |  |  |  |  |  |  |  |  |
Discount on notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 27,800,000 |  |  |  |  |  |  |  |  |  |  |
Deferred tax liability on notes |  |  |  |  |  | 1,939,000 |  |  |  |  |  |  |  |  | 10,600,000 |  |  |  |  |  |  |  |  |  |  |
Percentage of original principal amount of notes plus accrued and unpaid interest equalized repurchase |  |  |  |  |  |  |  |  |  |  |  |  |  | 102.00% |  |  |  |  |  | 104.95% |  |  |  |  |  |
Debt instrument, maturity date |  |  |  |  |  |  |  |  |  | Nov. 01, 2012 |  |  |  |  | Feb. 15, 2028 |  |  |  |  |  | Feb. 15, 2028 |  |  |  |  |
Senior credit facility, value of common stock converted | 50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000 |  |
Convertible notes for each $1,000 principal amount, amount of notes exchanged |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40,000,000 |  |  |  |  |  |  |  |
Convertible notes for each $1,000 principal amount, amount of aggregate consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 36,000,000 |  |  |  |
Redeemable price as a percentage of outstanding principal note amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |
Amount of notes exchanged |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,500,000 |  |  |  | 36,000,000 |  |  |  |  |  |
Loss on the extinguishment of debt |  |  |  |  |  |  |  |  |  |  | 2,100,000 |  | 900,000 | 1,000,000 |  | 1,100,000 |  |  |  | (5,400,000) |  |  |  |  |  |
Cash premium loss recognized on conversion of debt |  |  |  |  | 3,710,000 | 5,295,000 | 4,946,000 |  |  |  |  |  | 300,000 | 300,000 |  |  |  |  |  | 1,800,000 |  |  |  |  |  |
Contingent interest percentage on principal amount of notes, minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 120.00% |  |  |
Contingent interest payable rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.50% |  |  |
Common stock, shares issued |  |  |  |  | 53,123,978 | 51,957,652 | 36,753,891 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,568,867 |
Convertible notes for each $1,000 principal amount, number of shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 559,007 |  |  |  |  |  |  |  |  |  |
Convertible notes, interest payment period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 months |  |  |  |  |
Periodic prinicpal payments |  |  |  |  |  |  |  |  |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term loan, annual interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12.50%
Convertible notes for each $1000 principal amount, principal amount of 2010 Notes converted |  |  |  |  | 1,000 |  |  |  |  |  |  |  |  |  |  |  |  | 1,000 |  |  |  | 900 |  |  |  |
Senior note commitment fee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,300,000 |  |  |  |  |  |  |
Return of borrowed shares under share-based, shares |  |  | 659,340 | 701,102 | 659,340 | 701,102 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, commitment fee percentage |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |
Capital lease obligations |  |  |  |  | 1,784,000 | 1,642,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Notes Long Term Debt and Credit Facility (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective tax rate |  | 38.00% |  |  | 35.00% | 35.00% | 35.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible notes for each $1,000 principal amount, volume-weighted average price of common stock rate | 95.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible notes for each $1,000 principal amount, number of preceding trading days | 10 days |  |  |  | 5 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible notes for each $1,000 principal amount, number of shares |  |  |  |  | 43.9560 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible notes for each $1,000 principal amount, conversion price per share |  |  |  |  | $ 22.75 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assumed rate of accretion on notes | 9.90% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible notes for each $1,000 principal amount, third-party transaction costs | 800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share lending agreement, number of common stock shares loaned |  |  |  |  | 3,800,000 |  |  |  | 3,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Own share lending arrangement nominal loan fee per share |  |  |  |  |  |  |  | $ 0.0001 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowed shares outstanding |  |  |  |  | 2,439,558 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share lending agreement, fair value |  |  |  |  | 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common shares not subject to the share lending arrangement, fair value |  |  |  |  | 29,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes repurchased |  |  |  |  |  |  |  |  |  |  |  |  | $ 50,300,000 | $ 15,000,000 |  |  | $ 50,300,000 |  |  |  |  |  |  |  |  |

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