Share-Based Compensation (Summary of Unvested Stock Options Activity) (Details) shares in Thousands	3 Months Ended
	Mar. 31, 2018 $ / shares shares
Number of Shares
Unvested, beginning balance (in shares) | shares	200
Granted (in shares) | shares	0
Vested (in shares) | shares	0
Forfeited (in shares) | shares	0
Unvested, ending balance (in shares) | shares	200
Weighted Average Per Share Grant Date Fair Value
Unvested, beginning balance (in dollars per share) | $ / shares	$ 2.88
Granted (in dollars per share) | $ / shares	0.00
Vested (in dollars per share) | $ / shares	0.00
Forfeited (in dollars per share) | $ / shares	0.00
Unvested, ending balance (in dollars per share) | $ / shares	$ 2.88