Share Repurchases (Notes)

6 Months Ended

Jun. 30, 2016

Share Repurchases [Abstract]

Schedule of Repurchase Agreements [Table Text Block]

On August 4, 2015, we announced that our board of directors authorized the repurchase of an indeterminate number of our shares of common stock in the open market at an aggregate market value of up to $100 million. We repurchased 1.3 million shares of our common stock for $24.3 million during 2015, and 0.7 million and 2.5 million shares of our common stock for $15.1 million and $49.8 million during the three and six months ended June 30, 2016, respectively. We repurchased an additional 0.5 million shares of our common stock for $7.1 million during the period from July 1, 2016 through August 9, 2016. We are authorized to repurchase up to $18.8 million more of our common stock through June 8, 2017.

Any shares purchased that were not part of our publicly announced plan are related to repurchases of common stock pursuant to the provisions of employee benefit plans that permit the repurchase of shares to satisfy statutory tax withholding obligations.