Stock-Based Compensation (Schedule of Nonvested Restricted Stock Units Activity) (Details)	3 Months Ended
	Mar. 31, 2017 $ / shares shares
Number of shares
Non-vested at beginning of period (in shares) | shares	1,148,975
Granted (in shares) | shares	0
Vested (in shares) | shares	0
Canceled / forfeited (in shares) | shares	(2,841)
Non-vested at end of period (in shares) | shares	1,146,134
Weighted- average grant date fair value per share
Non-vested at beginning of period (in dollars per share) | $ / shares	$ 6.39
Granted (in dollars per share) | $ / shares	0.00
Vested (in dollars per share) | $ / shares	0.00
Canceled / forfeited (in dollars per share) | $ / shares	5.28
Non-vested at end of period (in dollars per share) | $ / shares	$ 6.39