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Related Party Transactions Related Party Transactions (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Related Party Transactions [Abstract]      
Payments for goods and services, related parties $ 0metr_PaymentsForGoodsAndServicesRelatedParties $ 0metr_PaymentsForGoodsAndServicesRelatedParties $ 128metr_PaymentsForGoodsAndServicesRelatedParties