Common Stock	12 Months Ended
Dec. 31, 2018
Equity [Abstract]
Common Stock	Common Stock Public Stock Offering On June 20, 2017, the Company closed a public stock offering and sold 1,954,852 shares of its common stock at $69.25 per share, for proceeds of approximately $130.8 million, net of underwriting discounts and commissions and other offering costs. Additionally, certain selling stockholders sold 545,148 shares of common stock in the offering for which the Company did not receive any proceeds. Selling stockholders received proceeds net of their proportionate share of the total underwriting discounts and commissions. The Company also granted the underwriters a 30-day overallotment option to purchase up to an additional 375,000 shares of its common stock at $69.25 per share prior to the underwriting discount. The overallotment option expired unexercised. Share Repurchase Program On August 6, 2015, the Company’s Board authorized a $100.0 million stock repurchase program for 3 years which commenced on November 5, 2015 and expired on November 4, 2018. There were no shares of common stock repurchased during the year ended December 31, 2018. In 2017, the Company repurchased 134,900 shares of its common stock for a total cost of $7.9 million, or an average price of $58.82 per share. On March 11, 2019, the Company’s Board of Directors authorized a $150 million stock repurchase program for 3 years which commenced on March 13, 2019 and expires on March 12, 2022. Stock repurchases may be made from time-to-time in open market transactions, privately negotiated transactions, through accelerated share repurchase programs, or by any combination of such methods. The timing of any repurchases and the actual number of shares repurchased will depend on a variety of factors, including our stock price, corporate and regulatory requirements, restrictions under our debt obligations and other market and economic conditions. No shares of common stock have been repurchased under this program to date.

Common Stock

Public Stock Offering

On June 20, 2017, the Company closed a public stock offering and sold 1,954,852 shares of its common stock at $69.25 per share, for proceeds of approximately $130.8 million, net of underwriting discounts and commissions and other offering costs. Additionally, certain selling stockholders sold 545,148 shares of common stock in the offering for which the Company did not receive any proceeds. Selling stockholders received proceeds net of their proportionate share of the total underwriting discounts and commissions. The Company also granted the underwriters a 30-day overallotment option to purchase up to an additional 375,000 shares of its common stock at $69.25 per share prior to the underwriting discount. The overallotment option expired unexercised.

Share Repurchase Program

On August 6, 2015, the Company’s Board authorized a $100.0 million stock repurchase program for 3 years which commenced on November 5, 2015 and expired on November 4, 2018. There were no shares of common stock repurchased during the year ended December 31, 2018. In 2017, the Company repurchased 134,900 shares of its common stock for a total cost of $7.9 million, or an average price of $58.82 per share.

On March 11, 2019, the Company’s Board of Directors authorized a $150 million stock repurchase program for 3 years which commenced on March 13, 2019 and expires on March 12, 2022. Stock repurchases may be made from time-to-time in open market transactions, privately negotiated transactions, through accelerated share repurchase programs, or by any combination of such methods. The timing of any repurchases and the actual number of shares repurchased will depend on a variety of factors, including our stock price, corporate and regulatory requirements, restrictions under our debt obligations and other market and economic conditions. No shares of common stock have been repurchased under this program to date.