Lease cost:

Amortization of right-of-use assets

$

838

$

1,419

$

3,144

$

4,903

Interest on lease obligations

65

180

426

602

Finance lease cost

903

1,599

3,570

5,505

Operating lease cost

1,240

1,919

4,514

6,077

Short-term lease cost

1,593

1,118

7,159

4,995

Total lease cost

$

3,736

$

4,636

$

15,243

$

16,577

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

Operating cash flows from finance leases

$

426

$

602

Operating cash flows from operating leases

5,330

7,880

Financing cash flows from finance leases

3,800

6,401

$

9,556

$

14,883

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

$

-

$

106

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

$

2,389

$

4,162

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

$

20

$

598

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

$

8,096

$

1,794

Weighted-average lease term (years):

Financing leases

4.0

4.5

Operating leases

4.2

4.6

Weighted-average discount rate (percentage):

Financing leases

4.1

%

3.9

%

Operating leases

5.0

%

4.7

%