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Common Stock and Treasury Stock	3 Months Ended
Common Stock and Treasury Stock	Mar. 31, 2018
Equity [Abstract]
Common Stock and Treasury Stock	7. Common Stock and Treasury Stock In 2005, the Company’s Board of Directors (“the Board”) approved a stock repurchase program authorizing the Company, as market and business conditions warrant, to acquire its common stock and periodically authorizes additional funds for the program. In February 2018, the Board approved $200.0 million for the stock repurchase program. The Company repurchased 1,346,427 shares for $31.1 million under the program during the three months ended March 31, 2018. Under the program to date, the Company has repurchased 43,129,393 shares for approximately $524.4 million. The maximum remaining authorized for purchase under the stock repurchase program was $200.0 million as of March 31, 2018.