Long-Term Debt Long-Term Debt - Credit Facility (Details) - USD ($)		3 Months Ended								12 Months Ended
	Mar. 30, 2017	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Nov. 08, 2019	Apr. 26, 2018
Line of Credit Facility
Repayments of long-term debt										$ 2,071,750,000	$ 605,636,000	$ 1,270,194,000
Debt extinguishment loss		$ 0	$ 0	$ 3,653,000	$ 0	$ 0	$ 0	$ 2,450,000	$ 0	3,653,000	$ 2,450,000	291,000
Revolving Credit Facility
Line of Credit Facility
Capitalized debt issuance cost													$ 6,400,000	$ 3,300,000
Revolving Credit Facility | Credit facility
Line of Credit Facility
Maximum borrowing capacity		1,250,000,000							1,100,000,000	1,250,000,000				1,250,000,000
Line of credit outstanding		$ 13,700,000								$ 13,700,000
Debt instrument, variable rate (percent)										2.50%
Weighted average interest rate (percent)		4.30%				5.40%				4.30%	5.40%
Undrawn capacity under revolving credit facility		$ 723,300,000								$ 723,300,000
Change in borrowing capacity										$ 250,000,000.0
Line of credit facility, commitment fee (percent)										0.375%
Commitment fee amount										$ 1,900,000	$ 2,100,000	$ 2,100,000
Maximum consolidated cash balance		50,000,000.0								50,000,000.0
Payments for debt issuance costs	$ 14,900,000
Revolving Credit Facility | Credit facility | Maximum
Line of Credit Facility
Undrawn capacity under revolving credit facility		$ 669,700,000								669,700,000
Revolving Credit Facility | Credit facility | Swing Line
Line of Credit Facility
Change in borrowing capacity										$ 50,000,000.0
Revolving Credit Facility | Partnership former credit facility
Line of Credit Facility
Repayments of long-term debt	648,400,000
Debt issuance cost written off	600,000
Debt extinguishment loss	$ 300,000
Letter of Credit | Credit facility
Line of Credit Facility
Maximum borrowing capacity									$ 25,000,000.0					$ 50,000,000.0
Line of Credit | Credit facility | LIBOR | Minimum
Line of Credit Facility
Debt instrument, variable rate (percent)										2.00%
Line of Credit | Credit facility | LIBOR | Maximum
Line of Credit Facility
Debt instrument, variable rate (percent)										2.75%
Line of Credit | Credit facility | Base Rate | Minimum
Line of Credit Facility
Debt instrument, variable rate (percent)										1.00%
Line of Credit | Credit facility | Base Rate | Maximum
Line of Credit Facility
Debt instrument, variable rate (percent)										1.75%
Line of Credit | Credit facility | Federal Funds Rate
Line of Credit Facility
Debt instrument, interest margin added to variable rate										0.50%
Line of Credit | Credit facility | One-month LIBOR
Line of Credit Facility
Debt instrument, interest margin added to variable rate										1.00%