Income Taxes:	3 Months Ended
Mar. 31, 2017
Income Tax Disclosure [Abstract]
Income Tax Disclosure [Text Block]	Income Taxes Income taxes were accrued at an estimated effective tax rate of (22)% and 25% for the three months ended March 31, 2017 and 2016, respectively. Those rates differ from that computed at the federal statutory rate of 35%. The effective tax rate for the three months ended March 31, 2017 differs from the federal statutory rate of 35% principally because of the effect the mix of U.S. and foreign incomes, state income taxes, tax credits, impact of the gain on bargain purchase, and included material discrete tax benefits related to the adoption of ASU 2016-09. The effective tax rate during the three months ended March 31, 2017 included a material tax benefit of $8.3 million related to the excess tax benefits recognized on stock option exercises and the vesting of restricted stock units during the period. The income tax benefit was treated as a discrete item when determining the annual estimated effective tax rate. The effective tax rate for the three months ended March 31, 2016 was adjusted from the rate reported in our March 31, 2016 quarterly report on Form 10-Q due to the adoption of ASU 2016-09 in the second quarter of 2016 (see Note 1: Basis of Presentation), which requires adjustments to be reflected as of the beginning of a fiscal year. The adjusted effective tax rate includes first quarter excess tax benefits on stock option exercises of $2.3 million recognized as an income tax benefit, which resulted in the difference in the effective tax rate as compared to the federal statutory rate.

Income Taxes:

3 Months Ended

Mar. 31, 2017

Income Taxes

Income taxes were accrued at an estimated effective tax rate of (22)% and 25% for the three months ended March 31, 2017 and 2016, respectively. Those rates differ from that computed at the federal statutory rate of 35%.

The effective tax rate for the three months ended March 31, 2017 differs from the federal statutory rate of 35% principally because of the effect the mix of U.S. and foreign incomes, state income taxes, tax credits, impact of the gain on bargain purchase, and included material discrete tax benefits related to the adoption of ASU 2016-09.

The effective tax rate during the three months ended March 31, 2017 included a material tax benefit of $8.3 million related to the excess tax benefits recognized on stock option exercises and the vesting of restricted stock units during the period. The income tax benefit was treated as a discrete item when determining the annual estimated effective tax rate.

The effective tax rate for the three months ended March 31, 2016 was adjusted from the rate reported in our March 31, 2016 quarterly report on Form 10-Q due to the adoption of ASU 2016-09 in the second quarter of 2016 (see Note 1: Basis of Presentation), which requires adjustments to be reflected as of the beginning of a fiscal year. The adjusted effective tax rate includes first quarter excess tax benefits on stock option exercises of $2.3 million recognized as an income tax benefit, which resulted in the difference in the effective tax rate as compared to the federal statutory rate.