CONSOLIDATED BALANCE SHEETS - USD ($)	Jun. 30, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 37,275,000	$ 14,644,000
Short-term investments	19,500,000	28,750,000
Accounts receivable, net of allowance for doubtful accounts of $775,000 at June 30, 2015 and $250,000 at December 31, 2014	31,297,000	37,133,000
Prepaid expenses and other assets	6,413,000	5,703,000
Current deferred tax asset	1,445,000	2,818,000
Total current assets	95,930,000	89,048,000
Property, plant and equipment	367,825,000	339,245,000
Less accumulated depreciation and amortization	(200,945,000)	(181,453,000)
Net property, plant and equipment	166,880,000	157,792,000
Intangibles, net	2,747,000
Total assets	265,557,000	246,840,000
Current liabilities:
Accounts payable	7,216,000	5,849,000
Accrued liabilities:
Payroll costs and other taxes	3,322,000	3,015,000
Other	4,988,000	3,158,000
Deferred revenue	5,265,000	1,752,000
Current maturities of notes payable and obligations under capital leases	8,892,000	6,018,000
Total current liabilities	29,683,000	19,792,000
Long-term liabilities:
Notes payable and obligations under capital leases less current maturities	6,039,000	4,209,000
Deferred tax liability	11,339,000	28,621,000
Total long-term liabilities	$ 17,378,000	$ 32,830,000
Commitments and contingencies
Stockholders' equity:
Preferred stock-par value $1.00 per share; 4,000,000 shares authorized, none outstanding
Common stock-par value $0.01 per share: 35,000,000 shares authorized, 21,571,513 and 14,216,540 issued and outstanding at June 30, 2015 and December 31, 2014, respectively	$ 216,000	$ 142,000
Additional paid-in capital	141,831,000	99,084,000
Retained earnings	76,867,000	95,336,000
Accumulated other comprehensive loss, net of tax	(418,000)	(344,000)
Total stockholders' equity	218,496,000	194,218,000
Total liabilities and stockholders' equity	$ 265,557,000	$ 246,840,000

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.