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Stock-Based Compensation	6 Months Ended
Stock-Based Compensation	Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation	Stock-Based Compensation Stock-based compensation totaled approximately $10.7 million and $19.0 million for the three and six months ended June 30, 2018, respectively. Stock-based compensation totaled approximately $8.6 million and $16.2 million for the three and six months ended June 30, 2017, respectively.