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Lease Agreements (Tables)
12 Months Ended
Dec. 31, 2016
Leases [Abstract]  
Future contractual payments under noncancelable leases
Future contractual payments under noncancelable leases for years ended December 31 (which exclude the effect of straight-line rents), are as follows: 
(in thousands)
 
2017
$
154,489

2018
138,724

2019
117,135

2020
97,155

2021
78,248

Thereafter
245,218

 
$
830,969