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Income Taxes: | 6 Months Ended
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Jun. 30, 2017
Income Tax Disclosure [Abstract] |
Income Tax Disclosure [Text Block] | Income Taxes Income taxes were accrued at an estimated effective tax rate of (182)% and 28% for the six months ended June 30, 2017 and 2016, respectively. Those rates differ from that computed at the federal statutory rate of 35%. The effective tax rate for the six months ended June 30, 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 and the impact of the gain on bargain purchase. The effective tax rate during the six months ended June 30, 2017 also included a material tax benefit of $9.9 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 six months ended June 30, 2016 differs from the federal statutory rate of 35% principally because of the effect of foreign and state income taxes, tax credits and deductions for domestic production activities. The effective tax rate during the six months ended June 30, 2016 also included a material tax benefit of $3.1 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.

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- Definition The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32559-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32718-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319 + Details
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