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Convertible Debt	9 Months Ended
Convertible Debt	Sep. 30, 2016
Debt Disclosure [Abstract]
Long-term Debt	Convertible Debt 2015 Convertible Senior Notes On February 17, 2015, the Company repaid at maturity the entire outstanding balance of the 4.5% convertible senior notes due 2015 (the "2015 convertible senior notes") in accordance with the terms thereof. No convertible senior notes were converted to common stock.