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Recent Accounting Pronouncements (Details Textual) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Weighted Average Number of Shares Outstanding, Diluted	31,254	31,115
Accounting Standards Update 2015-17 [Member]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets	$ 8
Minimum [Member] \| Accounting Standards Update 2016-09 [Member]
Weighted Average Number of Shares Outstanding, Diluted		31,104,495
Maximum [Member] \| Accounting Standards Update 2016-09 [Member]
Weighted Average Number of Shares Outstanding, Diluted		31,114,894

Amount of cumulative effect of the change in accounting principle or new accounting pronouncement on retained earnings or other components of equity or net assets in the statement of financial position as of the beginning of the earliest period presented.

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