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Subsequent Events	6 Months Ended
Subsequent Events	Jun. 30, 2018
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On July 26, 2018, the Company entered into an amendment to its existing credit agreement, dated as of December 12, 2017. The amendment provided a senior unsecured term loan in an aggregate principal of ¥47.5 billion or approximately $424.9 million, at the exchange rate effective on July 31, 2018. In connection with execution of this agreement, the Company drew down the full amount of the principal and also prepaid the remaining principal of its existing Japanese yen term loan of ¥43.8 billion or approximately $391.3 million. On August 8, 2018, the Company declared a quarterly cash dividend of $2.28 per share, which is payable on September 19, 2018 to the Company's common stockholders of record as of the close of business on August 22, 2018.