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Subsequent Event	12 Months Ended
Subsequent Event	Dec. 31, 2016
Statement of Stockholders' Equity [Abstract]
Subsequent Events [Text Block]	Subsequent Event On January 31, 2017, the Board of Directors approved a share repurchase program in which we may purchase up to $250 million of our common stock. Under the program, we may repurchase shares from time to time in open market transactions or in privately-negotiated transactions in accordance with applicable securities laws. We may discontinue the program at any time. The timing and the amount of any repurchases will be determined based on market conditions and other factors. Share repurchases will be funded with available cash on hand. Through date of filing, repurchases have been immaterial.