Income Taxes	6 Months Ended
Jun. 30, 2018
Income Taxes [Abstract]
Income Tax Disclosure [Text Block]	Income Taxes As a result of the enactment of the Tax Cuts and Jobs Act (TCJA), we recorded a provisional tax benefit of $1.7 million in the fourth quarter of 2017 based on our initial analysis of the TCJA using the best information and estimates available. During the second quarter 2018, we updated our provisional tax benefit based on new information, including a tax planning analysis, and recorded an additional $2.9 million provisional tax benefit. Due to the significant complexity of the TCJA, anticipated further guidance from the U.S. Treasury, the potential for additional guidance from the SEC/ FASB, or other new information becoming available, our provisional tax benefit may be further adjusted during 2018. Our provisional estimate is expected to be finalized no later than the fourth quarter of 2018. Further guidance and additional information regarding the TCJA may also impact our 2018 effective income tax rate, exclusive of any adjustment to the provisional tax benefit.

Income Taxes

6 Months Ended

Jun. 30, 2018

Income Taxes

As a result of the enactment of the Tax Cuts and Jobs Act (TCJA), we recorded a provisional tax benefit of $1.7 million in the fourth quarter of 2017 based on our initial analysis of the TCJA using the best information and estimates available. During the second quarter 2018, we updated our provisional tax benefit based on new information, including a tax planning analysis, and recorded an additional $2.9 million provisional tax benefit.

Due to the significant complexity of the TCJA, anticipated further guidance from the U.S. Treasury, the potential for additional guidance from the SEC/ FASB, or other new information becoming available, our provisional tax benefit may be further adjusted during 2018. Our provisional estimate is expected to be finalized no later than the fourth quarter of 2018. Further guidance and additional information regarding the TCJA may also impact our 2018 effective income tax rate, exclusive of any adjustment to the provisional tax benefit.