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Long-Term Debt - Additional Information (Details) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Debt Instrument [Line Items]
Long-term debt	$ 794,171,000	$ 794,171,000		$ 456,900,000
Amortization of debt discount		6,038,000	$ 0
Loans Payable
Debt Instrument [Line Items]
Long-term debt, gross	258,400,000	258,400,000
Long-term debt	256,748,000	256,748,000		144,064,000
Loans Payable | Amended and Restated Senior Credit Agreement
Debt Instrument [Line Items]
Face amount	265,000,000.0	265,000,000.0
Revolving line of credit
Debt Instrument [Line Items]
Long-term debt	247,000,000	247,000,000		312,000,000
Remaining borrowing capacity	335,500,000	335,500,000
Revolving line of credit | Amended and Restated Senior Credit Agreement
Debt Instrument [Line Items]
Maximum borrowing capacity	585,000,000.0	585,000,000.0
Letter of Credit
Debt Instrument [Line Items]
Letters of credit outstanding, amount	2,500,000	2,500,000
Convertible Notes Payable | 2.625% Convertible Notes Due 2024
Debt Instrument [Line Items]
Face amount	$ 345,000,000.0	$ 345,000,000.0
Interest rate, stated percentage	2.625%	2.625%
Interest rate, effective percentage	6.14%	6.14%
Debt Instrument, Convertible, Gross Amount of Equity Component	$ (51,600,000)	$ (51,600,000)
Amortization of debt discount	2,300,000	6,000,000.0
Interest expense, debt	$ 2,300,000	$ 6,000,000.0
Initial conversion rate		11.2608
Conversion price (in dollars per share)	$ 88.80	$ 88.80
Option indexed to issuer's equity, strike price (in dollars per share)		$ 114.92
Equity component of convertible debt	$ 39,100,000	$ 39,100,000
Long-term Debt | Amended and Restated Senior Credit Agreement
Debt Instrument [Line Items]
Interest rate, effective percentage	3.813%	3.813%
Mortgage notes
Debt Instrument [Line Items]
Long-term debt	$ 0	$ 0		$ 836,000
London Interbank Offered Rate (LIBOR) | Long-term Debt | Amended and Restated Senior Credit Agreement
Debt Instrument [Line Items]
Basis spread on variable rate		1.75%
Federal Funds Effective Swap Rate | Long-term Debt | Amended and Restated Senior Credit Agreement
Debt Instrument [Line Items]
Basis spread on variable rate		0.50%
Eurodollar | Long-term Debt | Amended and Restated Senior Credit Agreement
Debt Instrument [Line Items]
Basis spread on variable rate		1.00%
Call Option
Debt Instrument [Line Items]
Hedge and warrant transactions, net cash paid		$ 21,000,000.0

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