Stockholders' Equity (Stock Option Activity) (Details)	6 Months Ended
	Jun. 30, 2017 $ / shares shares
Number of Options Outstanding
Outstanding at beginning of period (in shares) | shares	759,719
Options granted (in shares) | shares	0
Options exercised (in shares) | shares	(64,374)
Options forfeited (in shares) | shares	(3,154)
Options expired (in shares) | shares	(94)
Outstanding at end of period (in shares) | shares	692,097.000
Weighted Average Exercise Price
Outstanding at beginning of period (in USD per share) | $ / shares	$ 6.06
Options granted (in USD per share) | $ / shares	0.00
Options exercised (in USD per share) | $ / shares	4.63
Options forfeited (in USD per share) | $ / shares	6.21
Options expired (in USD per share) | $ / shares	6.26
Outstanding at end of period (in USD per share) | $ / shares	$ 6.20