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Leases (Tables)
3 Months Ended
Mar. 31, 2019
Leases [Abstract]  
Contractual Obligation, Fiscal Year Maturity Schedule [Table Text Block]
 
Operating
 
Finance
2019
$
11,295

 
$
46,998

2020
9,550

 
51,943

2021
8,251

 
57,881

2022
7,282

 
21,842

2023
5,397

 
15,587

2024 and thereafter
37,841

 
40,447

Total
$
79,616

 
$
234,698

Less: Interest on finance leases
 
 
(22,746
)
Total principal payable on finance leases
 
 
$
211,952

 
Operating
 
Finance
 
Total
2019 (excluding the three months ended March 31, 2019)
$
8,527

 
$
35,237

 
$
43,764

2020
10,873

 
41,702

 
52,575

2021
9,460

 
59,553

 
69,013

2022
8,388

 
23,352

 
31,740

2023
6,241

 
16,569

 
22,810

Thereafter
43,574

 
39,990

 
83,564

Total lease payments
$
87,063

 
$
216,403

 
$
303,466

Less: Interest
(23,373
)
 
(22,445
)
 
(45,818
)
Present value of lease liabilities
$
63,690

 
$
193,958

 
$
257,648

Lessor, Operating Lease, Payments to be Received, Maturity [Table Text Block]
2019 (excluding the three months ended March 31, 2019)
$
1,949

2020
1,660

2021
1,312

2022
996

2023
426

Thereafter
94

Total cash receipts
$
6,437

Lease, Cost [Table Text Block]
Amortization of leased assets
$
10,964

Interest on lease liabilities
1,831

Total finance lease cost
12,795

Operating lease cost
3,194

Variable lease cost
372

Total lease cost
$
16,361