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Stock-Based Compensation	9 Months Ended
Stock-Based Compensation	Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation	Stock-Based Compensation Stock-based compensation totaled approximately $10.3 million and $29.3 million for the three and nine months ended September 30, 2018, respectively. Stock-based compensation totaled approximately $8.7 million and $24.9 million for the three and nine months ended September 30, 2017, respectively.