Common Stock Repurchase Programs	12 Months Ended
Dec. 31, 2018
Text Block [Abstract]
Common Stock Repurchase Programs	14. Common Stock Repurchase Programs: In July 2013, the Company’s Board of Directors authorized the repurchase of shares of the Company’s common stock up to an amount sufficient to offset the dilutive impact from the issuance of shares under the Company’s equity compensation programs. The share repurchase program allows the Company to make open market purchases from time-to-time based on general economic and market conditions and trading restrictions. The repurchase program also allows for the repurchase of shares of the Company’s common stock to offset the dilutive impact from the issuance of shares, if any, related to the Company’s acquisition program. Shares repurchased by the Company during the second quarter of 2018 completed the repurchases under the program with respect to issuances of shares under the Company’s equity compensation programs during 2018. In August 2018, the Company announced that its Board of Directors had authorized the repurchase of up to $500.0 million of the Company’s common stock in addition to its existing share repurchase program. As part of this repurchase program, on August 31, 2018, the Company entered into an uncollared accelerated share repurchase (“ASR”) agreement with an investment bank. Under the ASR agreement, the Company agreed to purchase $250.0 million of its common stock in total. On September 4, 2018, the Company paid a total of $250.0 million to the investment bank, which in turn delivered to the Company approximately 4.2 million shares of the Company’s common stock in total based on the market price of a share of Company common stock on August 31, 2018. The payment was recorded as a reduction to the respective components of shareholders’ equity. The ASR agreement was funded by borrowings under the Company’s Credit Agreement discussed in Note 10. Final settlement of the ASR occurred in December 2018 with the delivery to the Company of approximately 1.7 million additional shares of common stock. The final number of shares of common stock that the Company received was based upon the average daily volume weighted-average price of the Company’s common stock during the term of the ASR agreement, less a negotiated discount. Under the share repurchase programs described above, the Company repurchased approximately 7.0 million shares of its common stock for approximately $302.2 million during the year ended December 31, 2018, inclusive of 54,909 shares withheld to satisfy minimum statutory withholding obligations of $2.5 million in connection with the vesting of restricted stock and exercises of stock options during the second quarter of 2018. During the year ended December 31, 2017, the Company repurchased 1.0 million shares of its common stock for $70.2 million, inclusive of 38,257 shares withheld to satisfy minimum statutory withholding obligations of $2.1 million in connection with the vesting of restricted stock. The Company intends to utilize various methods to effect any future share repurchases, including, among others, open market purchases and accelerated share repurchase programs. The amount and timing of repurchases will depend upon several factors, including general economic and market conditions and trading restrictions.

14. Common Stock Repurchase Programs:

In July 2013, the Company’s Board of Directors authorized the repurchase of shares of the Company’s common stock up to an amount sufficient to offset the dilutive impact from the issuance of shares under the Company’s equity compensation programs. The share repurchase program allows the Company to make open market purchases from time-to-time based on general economic and market conditions and trading restrictions. The repurchase program also allows for the repurchase of shares of the Company’s common stock to offset the dilutive impact from the issuance of shares, if any, related to the Company’s acquisition program. Shares repurchased by the Company during the second quarter of 2018 completed the repurchases under the program with respect to issuances of shares under the Company’s equity compensation programs during 2018.

In August 2018, the Company announced that its Board of Directors had authorized the repurchase of up to $500.0 million of the Company’s common stock in addition to its existing share repurchase program. As part of this repurchase program, on August 31, 2018, the Company entered into an uncollared accelerated share repurchase (“ASR”) agreement with an investment bank. Under the ASR agreement, the Company agreed to purchase $250.0 million of its common stock in total. On September 4, 2018, the Company paid a total of $250.0 million to the investment bank, which in turn delivered to the Company approximately 4.2 million shares of the Company’s common stock in total based on the market price of a share of Company common stock on August 31, 2018. The payment was recorded as a reduction to the respective components of shareholders’ equity. The ASR agreement was funded by borrowings under the Company’s Credit Agreement discussed in Note 10. Final settlement of the ASR occurred in December 2018 with the delivery to the Company of approximately 1.7 million additional shares of common stock. The final number of shares of common stock that the Company received was based upon the average daily volume weighted-average price of the Company’s common stock during the term of the ASR agreement, less a negotiated discount.

Under the share repurchase programs described above, the Company repurchased approximately 7.0 million shares of its common stock for approximately $302.2 million during the year ended December 31, 2018, inclusive of 54,909 shares withheld to satisfy minimum statutory withholding obligations of $2.5 million in connection with the vesting of restricted stock and exercises of stock options during the second quarter of 2018.

During the year ended December 31, 2017, the Company repurchased 1.0 million shares of its common stock for $70.2 million, inclusive of 38,257 shares withheld to satisfy minimum statutory withholding obligations of $2.1 million in connection with the vesting of restricted stock.

The Company intends to utilize various methods to effect any future share repurchases, including, among others, open market purchases and accelerated share repurchase programs. The amount and timing of repurchases will depend upon several factors, including general economic and market conditions and trading restrictions.