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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Debt (Narrative) (Details) $ in Thousands		3 Months Ended		12 Months Ended
Debt (Narrative) (Details) $ in Thousands	Mar. 30, 2016 USD ($) debt_extension	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($) derivative_contract	Mar. 27, 2019 USD ($)
Debt Instrument [Line Items]
Debt service guaranty liability		$ 60,900		$ 60,900
Principal payments of debt		1,576	$ 151,931
Gain (loss) on extinguishment of debt				400
Debt instruments collateral value		600,000		$ 600,000
Finance lease obligation		21,875
Net premium/(discount) on debt		(4,400)
Deferred finance costs, net		(6,500)
Non-cash debt		1,700
Unsecured Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity under credit facility	$ 500,000
Number of credit facility 6-month extensions \| debt_extension	2
Line of credit facility, extension period	6 months
Bids amount (up to)		250,000
Maximum increase in credit facility amount (up to)		$ 850,000
Commitment fee percentage		0.15%		0.15%
Debt Service Guaranty [Member]
Debt Instrument [Line Items]
Debt coverage ratio		1.4
Par Value Debt [Member]
Debt Instrument [Line Items]
Principal payments of debt				$ 51,000
Short-Term Unsecured Facility [Member] \| Line of Credit [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity under credit facility					$ 10,000
Fixed interest rate loan period (in days)		30 days		30 days
Commitment fee percentage		0.10%		0.10%
Unused capacity, commitment fee percentage		0.05%		0.05%
Unsecured Variable-Rate Term Loan [Member] \| Unsecured Debt [Member]
Debt Instrument [Line Items]
Debt instrument, repurchased face amount				$ 200,000
Debt instrument, interest rate, effective percentage				2.50%
London Interbank Offered Rate (LIBOR) [Member] \| Unsecured Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Basis spread on variable rate		0.90%		0.90%
Thirty-Day LIBOR [Member] \| Short-Term Unsecured Facility [Member] \| Line of Credit [Member]
Debt Instrument [Line Items]
Basis spread on variable rate		1.25%		1.25%
Financial Standby Letter of Credit [Member]
Debt Instrument [Line Items]
Securities pledged as collateral		$ 5,200		$ 5,200
Guarantor obligations, maximum exposure, undiscounted		$ 5,000		$ 5,000
Interest Rate Contract [Member] \| Cash Flow Hedging [Member]
Debt Instrument [Line Items]
Number of interest rate derivatives terminated \| derivative_contract				3
Notional amount of interest rate fair value hedge derivatives				$ 200,000
Gain due to the probability that the related hedged forecasted transactions would no longer occur				$ 3,400