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Stockholders' equity and employee benefit plans | 12 Months Ended
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Dec. 31, 2016
Stockholders' Equity and Employee Benefit Plans Disclosure [Abstract] |
Stockholders' equity and employee benefit plans | Stockholders' equity and employee benefit plans Equity offering In December 2016, the Company offered and sold 4.0 million shares of the Company's common stock and raised $85.1 million in cash (net of expenses) pursuant to a public equity offering. Employee benefit plans The Company sponsors a 401(k) savings plan for US employees and related savings plans for certain non-US employees. These plans benefit eligible employees by allowing them the opportunity to make contributions up to certain limits. The Company contributes by matching a percentage of each employee's contributions. In 2015 and 2016, for certain plans, the Company suspended the matching of contributions. Subsequent to the closing of all acquisitions, employees of those acquired entities will generally be eligible to participate in the Company's 401(k) savings plan. The Company also has the discretion to provide a profit sharing contribution to each participant depending on the Company’s performance for the applicable year. The expense under the Company's plan was $1.4 million, $2.2 million, and $10.8 million for the years ended December 31, 2016, 2015 and 2014, respectively. The Company has an Employee Stock Purchase Plan, which allows eligible employees to purchase shares of the Company's common stock at six-month intervals through periodic payroll deductions at a price per share equal to 85% of the lower of the fair market value at the beginning and ending of the six-month intervals. Stock repurchases In October 2014, the Board of Directors approved a share repurchase program for the repurchase of outstanding shares of the Company's common stock with an aggregate purchase price of up to $150.0 million. The Company has purchased approximately 4.5 million shares primarily in 2014 under this program for aggregate consideration of approximately $100.2 million. However, we recently amended our credit facility in 2016 which prohibits us from repurchasing shares.

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