Capital Stock	12 Months Ended
Dec. 31, 2017
Capital Stock [Abstract]
Capital Stock	(16)Capital Stock On May 12, 2017 the Company filed a universal shelf registration statement on Form S-3 with the SEC which was declared effective by the SEC on June 2, 2017. Under this shelf registration statement, the Company may sell various debt and equity securities, or a combination thereof, to be offered from time-to-time up to an aggregate offering price of $300.0 million for all securities, and the selling stockholders may sell up to 3,000,000 shares of common stock in one or more offerings. In October 2017, the Company commenced an at-the-market offering program, which allows the Company to sell and issue up to 2.0 million shares of its common stock. In the three months ended December 41, 2017, the Company issued 888,453 shares of common stock under the at-the-market offering program for gross proceeds of $30.0 million. The Company paid commissions to the sales agent of $0.6 million and incurred other offering related expenses of $0.3 million. Net proceeds of $29.1 million were used for general corporate purposes. The Company has remaining capacity to issue up to approximately 1.1 million of additional shares of common stock under the at-the-market offering program.

Capital Stock

12 Months Ended

Dec. 31, 2017

(16)Capital Stock

On May 12, 2017 the Company filed a universal shelf registration statement on Form S-3 with the SEC which was declared effective by the SEC on June 2, 2017. Under this shelf registration statement, the Company may sell various debt and equity securities, or a combination thereof, to be offered from time-to-time up to an aggregate offering price of $300.0 million for all securities, and the selling stockholders may sell up to 3,000,000 shares of common stock in one or more offerings.

In October 2017, the Company commenced an at-the-market offering program, which allows the Company to sell and issue up to 2.0 million shares of its common stock. In the three months ended December 41, 2017, the Company issued 888,453 shares of common stock under the at-the-market offering program for gross proceeds of $30.0 million. The Company paid commissions to the sales agent of $0.6 million and incurred other offering related expenses of $0.3 million. Net proceeds of $29.1 million were used for general corporate purposes. The Company has remaining capacity to issue up to approximately 1.1 million of additional shares of common stock under the at-the-market offering program.