Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Commitments and Contingencies (Narrative) (Details)

v2.4.1.9
Commitments and Contingencies (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended 1 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Nov. 30, 2013
Commitments and Contingencies [Abstract]        
Rent expense $ 10.7us-gaap_LeaseAndRentalExpense $ 4.7us-gaap_LeaseAndRentalExpense $ 1.0us-gaap_LeaseAndRentalExpense  
Revolving credit facility [Member]        
Line of Credit Facility [Line Items]        
Revolving credit facility term       5 years
Amount of revolving credit facility       250us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
Revolving credit facility, maturity date       Oct. 31, 2018
Amount borrowed under credit facility $ 50us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember