Annual report pursuant to Section 13 and 15(d)

GOODWILL (Details)

GOODWILL (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Goodwill, Carrying Amount in Foreign Countries    
Carrying amount of goodwill in foreign countries $ 42,700rol_GoodwillCarryingAmountInForeignCountries $ 9,200rol_GoodwillCarryingAmountInForeignCountries
Changes in the carrying amount of goodwill    
Goodwill balance at the beginning of the period 211,847us-gaap_Goodwill 212,477us-gaap_Goodwill
Goodwill acquired 48,477us-gaap_GoodwillAcquiredDuringPeriod 40us-gaap_GoodwillAcquiredDuringPeriod
Goodwill adjustments due to currency translation (4,761)us-gaap_GoodwillTranslationAdjustments (670)us-gaap_GoodwillTranslationAdjustments
Goodwill balance at the end of the period $ 255,563us-gaap_Goodwill $ 211,847us-gaap_Goodwill