Stock-Based Compensation - Options (Details) $ / shares in Units, $ in Millions	9 Months Ended
	Sep. 30, 2016 USD ($) $ / shares shares
Number of Shares
Number of Shares, Options outstanding, Beginning Balance | shares	77,901
Number of Shares, Exercised | shares	(54,051)
Number of Shares, Options outstanding, Ending Balance | shares	23,850
Number of Shares, Options vested and exercisable | shares	23,850
Weighted Average Exercise Price
Weighted Average Exercise Price, Options outstanding, Beginning Balance | $ / shares	$ 10.11
Weighted Average Exercise Price, Exercised | $ / shares	10.71
Weighted Average Exercise Price, Options outstanding, Ending Balance | $ / shares	8.76
Weighted Average Exercise Price, Options vested and exercisable | $ / shares	$ 8.76
Stock Options
Weighted Average Exercise Price
Unrecognized compensation expense | $	$ 0.0