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Business Segment, Geographic and Major Customer Information (Revenue by Geographic Location) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Revenue by geographic location                      
Revenue $ 124,503us-gaap_Revenues $ 116,761us-gaap_Revenues $ 105,318us-gaap_Revenues $ 102,575us-gaap_Revenues $ 100,848us-gaap_Revenues $ 98,388us-gaap_Revenues $ 93,586us-gaap_Revenues $ 78,243us-gaap_Revenues $ 449,157us-gaap_Revenues $ 371,065us-gaap_Revenues $ 312,828us-gaap_Revenues
U.S. [Member]                      
Revenue by geographic location                      
Revenue                 370,087us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_US
319,649us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_US
272,945us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_US
Other countries [Member]                      
Revenue by geographic location                      
Revenue                 $ 79,070us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= ftk_OtherCountriesMember
$ 51,416us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= ftk_OtherCountriesMember
$ 39,883us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= ftk_OtherCountriesMember