Lease cost:

Amortization of right-of-use assets

$

4,048

$

6,134

$

6,715

Interest on lease obligations

547

767

959

Finance lease cost

4,595

6,901

7,674

Operating lease cost

5,603

8,222

13,506

Short-term lease cost

7,548

5,335

5,589

Total lease cost

$

17,746

$

20,458

$

26,769

Cash paid for amounts included in the measurement of lease obligations:

Operating cash flows from finance leases

$

547

$

767

$

959

Operating cash flows from operating leases

5,904

8,849

13,736

Financing cash flows from finance leases

4,815

7,956

8,814

$

11,266

$

17,572

$

23,509

Right-of-use assets obtained in exchange for new finance lease obligations

$

-

$

337

$

5,825

Right-of-use assets obtained in exchange for new operating lease obligations

$

2,980

$

5,409

$

4,362

Right-of-use assets derecognized upon early termination of finance leases

$

20

$

598

$

78

Right-of-use assets derecognized upon early termination of operating leases

$

7,572

$

1,688

$

3,510

Weighted-average lease term (years):

Finance leases

3.8

4.4

4.7

Operating leases

4.2

4.3

4.6

Weighted-average discount rate (percentage):

Finance leases

4.1

%

4.0

%

3.8

%