Long-term Equity-based Compensation - Activity Related to Nonvested Restricted Stock (Details)	12 Months Ended
	Dec. 31, 2019 $ / shares shares
Time Vested Restricted Stock Units
Number of Stock Units
Nonvested Balance at Beginning of Year (in shares) | shares	316,241
Grants in Period (in shares) | shares	23,383
Vested in Period (in shares) | shares	(135,909)
Forfeited in Period (in shares) | shares	(21,527)
Nonvested Balance at December 31, 2019 (in shares) | shares	182,188
Weighted- average Grant-date Fair Value Per Unit
Nonvested Balance at Beginning of Year (in dollars per share) | $ / shares	$ 65.36
Granted (in dollars per share) | $ / shares	82.56
Vested (in dollars per share) | $ / shares	61.59
Forfeited (in dollars per share) | $ / shares	69.48
Nonvested Balance at December 31, 2019 (in dollars per share) | $ / shares	$ 71.12
Performance Based Restricted Stock Units
Number of Stock Units
Nonvested Balance at Beginning of Year (in shares) | shares	327,300
Grants in Period (in shares) | shares	254,535
Vested in Period (in shares) | shares	(204,542)
Forfeited in Period (in shares) | shares	(16,473)
Nonvested Balance at December 31, 2019 (in shares) | shares	360,820
Weighted- average Grant-date Fair Value Per Unit
Nonvested Balance at Beginning of Year (in dollars per share) | $ / shares	$ 47.14
Granted (in dollars per share) | $ / shares	61.22
Vested (in dollars per share) | $ / shares	29.20
Forfeited (in dollars per share) | $ / shares	65.55
Nonvested Balance at December 31, 2019 (in dollars per share) | $ / shares	$ 66.42