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Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2018
Subsequent Events [Abstract]
Subsequent Events [Text Block]	Subsequent Events On January 23, 2019, as part of its interest rate sensitivity management, the Company entered into an interest rate collar derivative transaction with a $500.0 million notional based on 1 month LIBOR. The Company has designated this as a cash flow hedge transaction. On November 14, 2018, as modified on January 23, 2019, the board of directors approved a stock repurchase program to repurchase up to 2.9 million shares, up to a maximum aggregate purchase price of $100.0 million.