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Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2017
Subsequent Events [Abstract]
Subsequent Events	Subsequent Event Transition of Chief Executive Officer On February 21, 2018, the Company announced that Mr. John McDermott, its Chief Executive Officer, will step down effective as of a date no later than June 30, 2018. The Company currently anticipates that Mr. Dermott will continue to serve as the Company’s Chief Executive Officer through the completion of the recruitment and transition process to a new Chief Executive Officer and will remain available to the Company as necessary to facilitate a smooth leadership transition. The Board of Directors has commenced a search for a new Chief Executive Officer to replace Mr. Dermott.