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Condensed Consolidating Financial Information - Guarantor Subsidiaries - Condensed Consolidating Statements of Cash Flows (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Condensed Cash Flow Statements, Captions [Line Items]    
Net cash (used in) provided by operating activities $ (7,148) $ 108,155
Investing activities:    
Purchase of property and equipment (74,950) (48,244)
Proceeds from asset dispositions 13,233 3,469
Purchase of short-term investments (263,204) (560,148)
Proceeds from sale of short-term investments 259,322 458,468
Refund of deposits on aircraft   6,010
Payments of deposits on aircraft (197) (1,207)
Loan to unconsolidated affiliate (1,200)  
Net cash used in investing activities (66,996) (141,652)
Financing activities:    
Proceeds from line of credit 213,900 206,660
Payments on line of credit (139,000) (171,440)
Repurchase of common stock for payroll tax withholding requirements (524) (2,441)
Net cash provided by (used in) financing activities 74,376 32,779
Increase (decrease) in cash 232 (718)
Cash, beginning of period 2,407 6,270
Cash, end of period 2,639 5,552
Parent Company Only (issuer) [Member]    
Condensed Cash Flow Statements, Captions [Line Items]    
Net cash (used in) provided by operating activities (32,467) 39,490
Investing activities:    
Purchase of property and equipment (74,647) (48,244)
Proceeds from asset dispositions 13,233 3,469
Purchase of short-term investments (263,204) (560,148)
Proceeds from sale of short-term investments 259,322 458,468
Refund of deposits on aircraft   6,010
Payments of deposits on aircraft (197) (1,207)
Loan to unconsolidated affiliate (1,200)  
Net cash used in investing activities (66,693) (141,652)
Financing activities:    
Proceeds from line of credit 213,900 206,660
Payments on line of credit (139,000) (171,440)
Repurchase of common stock for payroll tax withholding requirements (524) (2,441)
Due to/from affiliate, net 24,774 70,792
Net cash provided by (used in) financing activities 99,150 103,571
Increase (decrease) in cash (10) 1,409
Cash, beginning of period 46 51
Cash, end of period 36 1,460
Guarantor Subsidiaries [Member]    
Condensed Cash Flow Statements, Captions [Line Items]    
Net cash (used in) provided by operating activities [1] 25,319 68,665
Investing activities:    
Purchase of property and equipment [1] (303)  
Net cash used in investing activities [1] (303)  
Financing activities:    
Due to/from affiliate, net [1] (24,774) (70,792)
Net cash provided by (used in) financing activities [1] (24,774) (70,792)
Increase (decrease) in cash [1] 242 (2,127)
Cash, beginning of period [1] 2,361 6,219
Cash, end of period [1] $ 2,603 $ 4,092
[1] Foreign subsidiaries represent minor subsidiaries and are included in the guarantor subsidiaries' amounts.