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Subsequent Event	12 Months Ended
Subsequent Event	Dec. 31, 2017
Subsequent Events [Abstract]
Subsequent Event	Subsequent Event Dividend Declaration In January 2018, we announced that our Board of Directors declared a $0.10 per share dividend for stockholders of record on February 6, 2018, and payable on February 20, 2018. Any future dividends that may be declared and paid from time to time will be subject to market and economic conditions, applicable legal requirements and other relevant factors. We are not obligated to continue a dividend for any fixed period, and payment of dividends may be suspended at any time at our discretion.