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Shareholders' Equity	12 Months Ended
Shareholders' Equity	Dec. 31, 2017
Equity [Abstract]
Shareholders' Equity	Shareholders’ Equity On February 5, 2015, the Company's Board of Directors authorized the repurchase of up to 15.0 million shares of common stock in the open market or through privately negotiated transactions. This authorization expired on February 5, 2017. On February 8, 2017, the Company’s Board of Directors authorized the repurchase of up to 15.0 million shares of common stock in the open market or through privately negotiated transactions. This authorization expires on February 8, 2019. During the year ended December 31, 2017, the company did not repurchase any shares. During the year ended December 31, 2017, the Company paid dividends quarterly at the rate of $0.15 per share for a total of $82.6 million. During the year ended December 31, 2016, the Company paid dividends quarterly at the rate of $0.12 per share for a total of $65.9 million. During the year ended December 31, 2015, the Company paid dividends quarterly at the rate of $0.11 per share for a total of $61.4 million.