v3.5.0.2

Condensed Consolidating Financial Information - Guarantor Subsidiaries - Condensed Consolidating Balance Sheets (Detail) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015 | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Current Assets: |  |  |  |  |
Cash |  | $ 8,567 | $ 2,407 | $ 3,659 | $ 6,270
Short-term investments |  | 289,235 | 284,523 |  |
Accounts receivable - net |  | 148,412 | 144,778 |  |
Inventories of spare parts - net |  | 69,424 | 69,491 |  |
Prepaid expenses |  | 7,802 | 8,951 |  |
Deferred income taxes |  | 10,379 | 10,379 |  |
Income taxes receivable |  | 709 | 761 |  |
Total current assets |  | 534,528 | 521,290 |  |
Property and equipment - net |  | 893,235 | 883,529 |  |
Restricted investments |  | 13,038 | 15,336 |  |
Other assets |  | 6,317 | 6,178 |  |
Total assets |  | 1,447,118 | 1,426,333 |  |
Current Liabilities: |  |  |  |  |
Accounts payable |  | 23,462 | 31,373 |  |
Accrued and other current liabilities |  | 40,343 | 44,759 |  |
Total current liabilities |  | 63,805 | 76,132 |  |
Long-term debt: |  |  |  |  |
Revolving credit facility |  | 95,000 | 57,500 |  |
Senior Notes dated March 17, 2014, net of debt issuance costs of $3,376 |  | 496,624 | 496,001 |  |
Deferred income taxes and other long-term liabilities |  | 166,343 | 169,702 |  |
Shareholders' Equity: |  |  |  |  |
Common stock and paid-in capital |  | 308,835 | 306,444 |  |
Accumulated other comprehensive income (loss) |  | 45 | (567) |  |
Retained earnings |  | 316,466 | 321,121 |  |
Total shareholders' equity |  | 625,346 | 626,998 | 614,920 | 597,068
Total liabilities and shareholders' equity |  | 1,447,118 | 1,426,333 |  |
Parent Company Only (issuer) [Member] |  |  |  |  |
Current Assets: |  |  |  |  |
Cash |  | 40 | 46 | 48 | 51
Short-term investments |  | 289,235 | 284,523 |  |
Accounts receivable - net |  | 64,631 | 70,336 |  |
Inventories of spare parts - net |  | 60,768 | 60,060 |  |
Prepaid expenses |  | 4,821 | 7,162 |  |
Deferred income taxes |  | 10,379 | 10,379 |  |
Income taxes receivable |  | 950 | 1,002 |  |
Total current assets |  | 430,824 | 433,508 |  |
Investment in subsidiaries |  | 343,068 | 330,848 |  |
Property and equipment - net |  | 598,361 | 632,759 |  |
Restricted investments |  | 13,023 | 15,336 |  |
Other assets |  | 5,191 | 5,975 |  |
Total assets |  | 1,390,467 | 1,418,426 |  |
Current Liabilities: |  |  |  |  |
Accounts payable |  | 16,742 | 25,512 |  |
Accrued and other current liabilities |  | 28,825 | 29,138 |  |
Intercompany payable |  | 47,588 | 90,943 |  |
Total current liabilities |  | 93,155 | 145,593 |  |
Long-term debt: |  |  |  |  |
Revolving credit facility |  | 95,000 | 57,500 |  |
Senior Notes dated March 17, 2014, net of debt issuance costs of $3,376 |  | 496,624 | 496,001 |  |
Deferred income taxes and other long-term liabilities |  | 80,342 | 92,334 |  |
Shareholders' Equity: |  |  |  |  |
Common stock and paid-in capital |  | 308,835 | 306,444 |  |
Accumulated other comprehensive income (loss) |  | 45 | (567) |  |
Retained earnings |  | 316,466 | 321,121 |  |
Total shareholders' equity |  | 625,346 | 626,998 |  |
Total liabilities and shareholders' equity |  | 1,390,467 | 1,418,426 |  |
Guarantor Subsidiaries [Member] |  |  |  |  |
Current Assets: |  |  |  |  |
Cash | [1] | 8,527 | 2,361 | $ 3,611 | $ 6,219
Accounts receivable - net | [1] | 83,781 | 74,442 |  |
Intercompany receivable | [1] | 47,588 | 90,943 |  |
Inventories of spare parts - net | [1] | 8,656 | 9,431 |  |
Prepaid expenses | [1] | 2,981 | 1,789 |  |
Income taxes receivable | [1] | (241) | (241) |  |
Total current assets | [1] | 151,292 | 178,725 |  |
Property and equipment - net | [1] | 294,874 | 250,770 |  |
Restricted investments | [1] | 15 |  |  |
Other assets | [1] | 1,126 | 203 |  |
Total assets | [1] | 447,307 | 429,698 |  |
Current Liabilities: |  |  |  |  |
Accounts payable | [1] | 6,720 | 5,861 |  |
Accrued and other current liabilities | [1] | 11,518 | 15,621 |  |
Total current liabilities | [1] | 18,238 | 21,482 |  |
Long-term debt: |  |  |  |  |
Deferred income taxes and other long-term liabilities | [1] | 86,001 | 77,368 |  |
Shareholders' Equity: |  |  |  |  |
Common stock and paid-in capital | [1] | 79,191 | 79,061 |  |
Retained earnings | [1] | 263,877 | 251,787 |  |
Total shareholders' equity | [1] | 343,068 | 330,848 |  |
Total liabilities and shareholders' equity | [1] | 447,307 | 429,698 |  |
Eliminations [Member] |  |  |  |  |
Current Assets: |  |  |  |  |
Intercompany receivable |  | (47,588) | (90,943) |  |
Total current assets |  | (47,588) | (90,943) |  |
Investment in subsidiaries |  | (343,068) | (330,848) |  |
Total assets |  | (390,656) | (421,791) |  |
Current Liabilities: |  |  |  |  |
Intercompany payable |  | (47,588) | (90,943) |  |
Total current liabilities |  | (47,588) | (90,943) |  |
Shareholders' Equity: |  |  |  |  |
Common stock and paid-in capital |  | (79,191) | (79,061) |  |
Retained earnings |  | (263,877) | (251,787) |  |
Total shareholders' equity |  | (343,068) | (330,848) |  |
Total liabilities and shareholders' equity |  | $ (390,656) | $ (421,791) |  |
[1] | Foreign subsidiaries represent minor subsidiaries and are included in the guarantor subsidiaries' amounts.

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- Definition The carrying value as of the balance sheet date of the noncurrent portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=28361426&loc=d3e1314-112600 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=28361426&loc=d3e1336-112600 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Line-of-Credit Arrangement -URI http://asc.fasb.org/extlink&oid=6517033 + Details
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- Definition Amount of noncurrent assets classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of asset related to consideration paid in advance for costs that provide economic benefits within a future period of one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6787-107765 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 10 -Section 05 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=68074540&loc=d3e5879-108316 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Current Assets -URI http://asc.fasb.org/extlink&oid=6509628 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 + Details
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- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(14)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(8)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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- Definition This element represents the noncurrent portion of investments which are not defined as or included in marketable (debt, equity, or other) securities that are pledged or subject to withdrawal restrictions. + References No definition available. + Details
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- Definition The cumulative amount of the reporting entity's undistributed earnings or deficit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(23)(a)(4)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)(a)(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion. Senior note holders are paid off in full before any payments are made to junior note holders. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of investments including trading securities, available-for-sale securities, held-to-maturity securities, and short-term investments classified as other and current. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)(g)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(5)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(4)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(31)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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