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Other Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Dec. 31, 2012
Other Liabilities Disclosure [Abstract]      
Unrecognized Tax Benefits $ 22,079 $ 12,742 $ 5,925
Off-market Lease, Unfavorable 319 394  
Unrecognized tax benefit netted against a deferred tax asset for a net operating loss carryforward (6,504) (8,422)  
Other Liabilities 1 5  
Other liabilities $ 15,895 $ 4,719