Common Stock	6 Months Ended
Jun. 30, 2017
Equity [Abstract]
Common Stock	Common Stock Share Repurchase Program and Secondary Offering In March 2016, the Company’s Board of Directors approved a securities repurchase program (the “Program”) authorizing the Company to repurchase, in the aggregate, up to $125,000 of its outstanding common stock or warrants to purchase common stock. Under the Program, repurchases may be made on the open market or through private transactions, as determined by the Company’s management and in accordance with prevailing market conditions and federal securities laws and regulations. During the six months ended June 30, 2017, the Company repurchased 92,409 shares at an average purchase price of $100.85 per share, excluding commissions, for a total cost of $9,319, of which $7,514 was settled in cash during the quarter. In March 2016, certain selling stockholders affiliated with Silver Point Capital, L.P., Oak Hill Advisors, L.P. and Capital World Investors (the “Selling Stockholders”) sold 2,278,031 shares, including overallotments, of the Company’s common stock at a public offering price of $68.00 per share, in a secondary public offering. Of the 2,278,031 shares sold in the offering, 350,000 shares were purchased by the Company for $23,800. The Company paid the underwriting discounts and commissions payable on the shares sold by the Selling Stockholders, excluding the shares the Company repurchased, resulting in $5,900 of fees incurred for the six months ended June 30, 2016, which is included in other expense, net in the condensed consolidated statement of net income. The Company also incurred approximately $600 of other expenses related to legal and audit services for the six months ended June 30, 2016, which is included in selling, administration & engineering expenses in the condensed consolidated statement of net income. The Company did not sell or receive any proceeds from the sales of shares by the Selling Stockholders. As of June 30, 2017, the Company had approximately $91,900 of repurchase authorization remaining under the Program.

Common Stock

Share Repurchase Program and Secondary Offering

In March 2016, the Company’s Board of Directors approved a securities repurchase program (the “Program”) authorizing the Company to repurchase, in the aggregate, up to $125,000 of its outstanding common stock or warrants to purchase common stock. Under the Program, repurchases may be made on the open market or through private transactions, as determined by the Company’s management and in accordance with prevailing market conditions and federal securities laws and regulations. During the six months ended June 30, 2017, the Company repurchased 92,409 shares at an average purchase price of $100.85 per share, excluding commissions, for a total cost of $9,319, of which $7,514 was settled in cash during the quarter.

In March 2016, certain selling stockholders affiliated with Silver Point Capital, L.P., Oak Hill Advisors, L.P. and Capital World Investors (the “Selling Stockholders”) sold 2,278,031 shares, including overallotments, of the Company’s common stock at a public offering price of $68.00 per share, in a secondary public offering. Of the 2,278,031 shares sold in the offering, 350,000 shares were purchased by the Company for $23,800. The Company paid the underwriting discounts and commissions payable on the shares sold by the Selling Stockholders, excluding the shares the Company repurchased, resulting in $5,900 of fees incurred for the six months ended June 30, 2016, which is included in other expense, net in the condensed consolidated statement of net income. The Company also incurred approximately $600 of other expenses related to legal and audit services for the six months ended June 30, 2016, which is included in selling, administration & engineering expenses in the condensed consolidated statement of net income. The Company did not sell or receive any proceeds from the sales of shares by the Selling Stockholders.

As of June 30, 2017, the Company had approximately $91,900 of repurchase authorization remaining under the Program.