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Shares Repurchased	9 Months Ended
Shares Repurchased	Sep. 30, 2017
Equity [Abstract]
Shares Repurchased	13. Shares Repurchased On October 29, 2014, the Company’s Board of Directors authorized a three-year share repurchase program of up to $100,000. On April 27, 2016, the Board of Directors approved a $60,000 increase to the Company’s share repurchase program and extended the term through April 27, 2019. Included under this program are purchases to offset future equity grants made under the Company’s equity plans and are made in open market or privately negotiated transactions. This authority may be exercised from time to time and in such amounts as market conditions warrant, and subject to regulatory considerations. The timing and actual number of shares repurchased depends on a variety of factors including price, corporate and regulatory requirements, market conditions and other corporate liquidity requirements and priorities. The repurchase program may be suspended or terminated at any time without prior notice. Shares repurchased under this program are returned to the status of authorized and unissued on the Company’s books and records. During the three and nine months ended September 30, 2017, the Company repurchased 47,317 and 401,813 shares of its common stock, respectively, under this program for an aggregate cost of $484 and $4,178, respectively. During the three and nine months ended September 30, 2016, the Company repurchased 337,824 and 3,753,147 shares of its common stock, respectively, under this program for an aggregate cost of $3,462 and $39,116, respectively. As of September 30, 2017, $92,327 remains available under this program for future purchases.