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Share Repurchases
3 Months Ended
Mar. 31, 2016
Stockholders' Equity Note [Abstract]  
Share repurchases
16. Share Repurchases

In January 2015, the Board of Directors approved a standing share repurchase authorization, whereby the Company may repurchase up to 15,000,000 shares of its common stock over the following three years. This plan replaced all previously authorized repurchase programs. During the three months ended March 31, 2016, the Company repurchased no shares of common stock under the January 2015 authorization. As of March 31, 2016, there were 6,771,458 shares available for repurchase under this plan.

A summary of share repurchase activity during the three months ended March 31, 2015 is as follows:
Shares of common stock repurchased
2,753,165

Spending on share repurchases (in thousands)
$
200,055

Average price paid per share
$
72.66