Convertible Debt (Tables)	12 Months Ended
Dec. 31, 2013
Short-term Debt [Line Items]
Schedule of Debt	As of December 31, 2013 and 2012, the Company had outstanding 2013 and 2015 convertible senior notes with a combined face value of $18.0 million and $34.9 million. Of these balances $0.0 million and $16.9 million were classified as current liabilities in the Consol
Convertible Senior Notes [Member]
Short-term Debt [Line Items]
Schedule of Debt	2013 Convertible Senior Notes On February 15, 2013, the Company repaid at maturity the entire outstanding balance of the 2.75% convertible senior notes due 2013 (the "2013 convertible senior notes") in accordance with the terms thereof. 2015 Convertible Senior Notes On June 20, 2012, the Company entered into subscription agreements with certain holders of the Company's 2013 convertible senior notes. Pursuant to the subscription agreements, on June 29, 2012 the Company exchanged $18.0 million aggregate principal amount of the 2013 convertible senior notes for $18.0 million aggregate principal amount of the Company's 2015 convertible senior notes. The 2015 convertible senior notes mature on February 15, 2015 and have a coupon rate of 4.5%. Holders of the 2015 convertible senior notes may convert their notes into a number of shares of the Company's common stock determined as set forth in the indenture governing the notes at their option on any day to and including the business day prior to the maturity date. The 2015 convertible senior notes are initially convertible into 117.2333 shares of the Company's common stock per $1,000 principal amount of the notes (which is equivalent to a conversion price of approximately $8.53 per share), subject to adjustment upon the occurrence of certain events. Upon the occurrence of a fundamental change, holders of the 2015 convertible senior notes may require the Company to repurchase some or all of their notes for cash at a price equal to 100% of the principal amount of the notes being repurchased, plus accrued and unpaid interest, if any. In addition, if certain fundamental changes occur, the Company may be required in certain circumstances to increase the conversion rate for any 2015 convertible senior notes converted in connection with such fundamental changes by a specified number of shares of the Company's common stock. The 2015 convertible senior notes are the Company's general unsecured obligations and rank equal in right of payment to all of its existing and future senior indebtedness, and senior in right of payment to the Company's future subordinated debt. The Company's obligations under the 2015 convertible senior notes are not guaranteed by, and are effectively subordinated in right of payment to all existing and future obligations of its subsidiaries and are effectively subordinated in right of payment to its future secured indebtedness to the extent of the assets securing such debt. As of December 31, 2013 and 2012, the Company had outstanding 2013 and 2015 convertible senior notes with a combined face value of $18.0 million and $34.9 million. Of these balances $0.0 million and $16.9 million were classified as current liabilities in the Consolidated Balance Sheets at December 31, 2013 and 2012. As of December 31, 2013 and 2012, the estimated fair value of the Company's 2015 convertible senior notes was $17.8 million and $17.7 million

2013 Convertible Senior Notes

On February 15, 2013, the Company repaid at maturity the entire outstanding balance of the 2.75% convertible senior notes due 2013 (the "2013 convertible senior notes") in accordance with the terms thereof.

2015 Convertible Senior Notes

On June 20, 2012, the Company entered into subscription agreements with certain holders of the Company's 2013 convertible senior notes. Pursuant to the subscription agreements, on June 29, 2012 the Company exchanged $18.0 million aggregate principal amount of the 2013 convertible senior notes for $18.0 million aggregate principal amount of the Company's 2015 convertible senior notes. The 2015 convertible senior notes mature on February 15, 2015 and have a coupon rate of 4.5%. Holders of the 2015 convertible senior notes may convert their notes into a number of shares of the Company's common stock determined as set forth in the indenture governing the notes at their option on any day to and including the business day prior to the maturity date. The 2015 convertible senior notes are initially convertible into 117.2333 shares of the Company's common stock per $1,000 principal amount of the notes (which is equivalent to a conversion price of approximately $8.53 per share), subject to adjustment upon the occurrence of certain events. Upon the occurrence of a fundamental change, holders of the 2015 convertible senior notes may require the Company to repurchase some or all of their notes for cash at a price equal to 100% of the principal amount of the notes being repurchased, plus accrued and unpaid interest, if any. In addition, if certain fundamental changes occur, the Company may be required in certain circumstances to increase the conversion rate for any 2015 convertible senior notes converted in connection with such fundamental changes by a specified number of shares of the Company's common stock. The 2015 convertible senior notes are the Company's general unsecured obligations and rank equal in right of payment to all of its existing and future senior indebtedness, and senior in right of payment to the Company's future subordinated debt. The Company's obligations under the 2015 convertible senior notes are not guaranteed by, and are effectively subordinated in right of payment to all existing and future obligations of its subsidiaries and are effectively subordinated in right of payment to its future secured indebtedness to the extent of the assets securing such debt.

As of December 31, 2013 and 2012, the Company had outstanding 2013 and 2015 convertible senior notes with a combined face value of $18.0 million and $34.9 million. Of these balances $0.0 million and $16.9 million were classified as current liabilities in the Consolidated Balance Sheets at December 31, 2013 and 2012. As of December 31, 2013 and 2012, the estimated fair value of the Company's 2015 convertible senior notes was $17.8 million and $17.7 million