Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 30,683	$ 38,520
Restricted cash	47,125	47,703
Trade accounts receivable, net of allowance of $1,519 and $1,523, respectively	163,248	148,444
Accounts receivable - related parties	23	22
Income tax receivable	1,587	1,878
Inventories	38,657	36,403
Prepaid expenses	17,552	22,353
Other current assets	4,223	4,292
Total current assets	303,098	299,615
Property and equipment, net	480,552	502,579
Deferred debt costs, net of amortization	2,511	2,497
Intangible assets, net of amortization	3,102	3,221
Other assets	12,971	12,568
Total assets	802,234	820,480
Current liabilities:
Accounts payable	90,268	80,518
Accrued expenses	60,042	51,973
Current portion of long-term debt, net of discounts of $990 and $1,657, respectively	48,882	55,997
Other current liabilities	4,168	2,469
Total current liabilities	203,360	190,957
Long-term debt, net of discounts and deferred financing costs of $8,143 and $10,244, respectively	279,032	259,242
Deferred tax liabilities	0	78
Other long-term liabilities	36,691	31,550
Stockholders' equity:
Preferred stock; $0.01 par value; 5,000,000 shares authorized; none designated or issued at March 31, 2018 and December 31, 2017	0	0
Common stock; $0.01 par value; 80,000,000 shares authorized; 26,644,130 shares issued and 26,470,750 shares outstanding at June 30, 2018; 26,371,572 shares issued and 26,219,129 shares outstanding at December 31, 2017	266	264
Additional paid-in capital	453,907	439,517
Accumulated deficit	(167,259)	(96,674)
Treasury stock, at cost, 173,380 and 152,443 shares at June 30, 2018 and December 31, 2017, respectively	(3,763)	(4,454)
Total stockholders' equity	283,151	338,653
Total liabilities and stockholders' equity	$ 802,234	$ 820,480