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Condensed Consolidating Financial Statements - Condensed Consolidating Statements of Cash Flows (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Condensed Cash Flow Statements, Captions [Line Items]    
Cash flows from operating activities $ 17,887 $ (19,322)
Cash flows from investing activities    
Capital expenditures for property and equipment (3,687) (5,080)
Proceeds from sale of business, property and equipment 134 5,074
Long-term loans and advances to affiliates 0 0
Net cash used in investing activities (3,553) (6)
Cash flows from financing activities    
Borrowings of debt 20,000 0
Repayments of debt (51,063) (50,729)
Repurchases of stock (973) (1,946)
Long-term loans and advances (to) from affiliates 0 0
Dividend paid to affiliates   0
Net cash used in financing activities (32,036) (52,675)
Effect of exchange rate changes on cash 155 (873)
Net decrease in cash, cash equivalents and restricted cash (17,547) (72,876)
Cash, cash equivalents and restricted cash at beginning of period 47,241 115,216
Cash, cash equivalents and restricted cash at end of period 29,694 42,340
Reportable Legal Entities | FET (Parent)    
Condensed Cash Flow Statements, Captions [Line Items]    
Cash flows from operating activities 3,037 7,196
Cash flows from investing activities    
Capital expenditures for property and equipment 0 0
Proceeds from sale of business, property and equipment 0 0
Long-term loans and advances to affiliates 27,936 45,234
Net cash used in investing activities 27,936 45,234
Cash flows from financing activities    
Borrowings of debt 20,000  
Repayments of debt (50,000) (50,000)
Repurchases of stock (973) (1,946)
Long-term loans and advances (to) from affiliates 0 0
Dividend paid to affiliates   0
Net cash used in financing activities (30,973) (51,946)
Effect of exchange rate changes on cash 0 0
Net decrease in cash, cash equivalents and restricted cash 0 484
Cash, cash equivalents and restricted cash at beginning of period 0 0
Cash, cash equivalents and restricted cash at end of period 0 484
Reportable Legal Entities | Guarantor Subsidiaries    
Condensed Cash Flow Statements, Captions [Line Items]    
Cash flows from operating activities 18,284 3,050
Cash flows from investing activities    
Capital expenditures for property and equipment (3,294) (3,944)
Proceeds from sale of business, property and equipment 134 785
Long-term loans and advances to affiliates 799 0
Net cash used in investing activities (2,361) (3,159)
Cash flows from financing activities    
Borrowings of debt 0  
Repayments of debt (1,063) (692)
Repurchases of stock 0 0
Long-term loans and advances (to) from affiliates (27,936) (45,234)
Dividend paid to affiliates   0
Net cash used in financing activities (28,999) (45,926)
Effect of exchange rate changes on cash 0 0
Net decrease in cash, cash equivalents and restricted cash (13,076) (46,035)
Cash, cash equivalents and restricted cash at beginning of period 24,977 73,981
Cash, cash equivalents and restricted cash at end of period 11,901 27,946
Reportable Legal Entities | Non-Guarantor Subsidiaries    
Condensed Cash Flow Statements, Captions [Line Items]    
Cash flows from operating activities (3,434) (5,618)
Cash flows from investing activities    
Capital expenditures for property and equipment (393) (1,136)
Proceeds from sale of business, property and equipment 0 4,289
Long-term loans and advances to affiliates 0 0
Net cash used in investing activities (393) 3,153
Cash flows from financing activities    
Borrowings of debt 0  
Repayments of debt 0 (37)
Repurchases of stock 0 0
Long-term loans and advances (to) from affiliates (799) 0
Dividend paid to affiliates   (23,950)
Net cash used in financing activities (799) (23,987)
Effect of exchange rate changes on cash 155 (873)
Net decrease in cash, cash equivalents and restricted cash (4,471) (27,325)
Cash, cash equivalents and restricted cash at beginning of period 22,264 41,235
Cash, cash equivalents and restricted cash at end of period 17,793 13,910
Eliminations    
Condensed Cash Flow Statements, Captions [Line Items]    
Cash flows from operating activities 0 (23,950)
Cash flows from investing activities    
Capital expenditures for property and equipment 0 0
Proceeds from sale of business, property and equipment 0 0
Long-term loans and advances to affiliates (28,735) (45,234)
Net cash used in investing activities (28,735) (45,234)
Cash flows from financing activities    
Borrowings of debt 0  
Repayments of debt 0 0
Repurchases of stock 0 0
Long-term loans and advances (to) from affiliates 28,735 45,234
Dividend paid to affiliates   23,950
Net cash used in financing activities 28,735 69,184
Effect of exchange rate changes on cash 0 0
Net decrease in cash, cash equivalents and restricted cash 0 0
Cash, cash equivalents and restricted cash at beginning of period 0 0
Cash, cash equivalents and restricted cash at end of period $ 0 $ 0