General - Stock Compensation - Options - Activity (Details)	9 Months Ended
	Sep. 30, 2019 $ / shares shares
Options
Outstanding, beginning of period (in shares) | shares	2,352,609
Granted (in shares) | shares	416,624
Forfeited (in shares) | shares	(60,475)
Exercised (in shares) | shares	(389,368)
Outstanding, end of period (in shares) | shares	2,319,390
Weighted Average Exercise Price
Outstanding, beginning of period (in dollars per share) | $ / shares	$ 68.10
Granted (in dollars per share) | $ / shares	66.13
Forfeited (in dollars per share) | $ / shares	81.60
Exercised (in dollars per share) | $ / shares	60.31
Outstanding, end of period (in dollars per share) | $ / shares	$ 68.70
Vested and Expected to Vest
Vested and expected to vest end of period (in shares) | shares	2,303,496
Vested and expected to vest end of period (in dollars per share) | $ / shares	$ 68.67
Exercisable, end of period (in shares) | shares	1,500,864
Exercisable, end of period (in dollars per share) | $ / shares	$ 64.42