Stock-Based Compensation - Restricted Stock Units (Details) - Restricted Stock Units (RSU)	9 Months Ended
	Sep. 30, 2019 $ / shares shares
Restricted Stock Units
Balance at Beginning of Period (in shares) | shares	3,478.31
Granted (in shares) | shares	4,018.03
Balance at End of Period (in shares) | shares	7,496
Weighted Average Grant Date Fair Value
Outstanding at Beginning of period (in dollars per share) | $ / shares	$ 31.62
Granted (in dollars per share) | $ / shares	30.79
Outstanding at End of period (in dollars per share) | $ / shares	$ 31.17