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Fair Value (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Assets:
Interest rate cap agreement	$ 14us-gaap_DerivativeAssets
Liabilities:
Contingently convertible Series E units liability	72,057amh_ConvertibleSeriesEUnits	66,938amh_ConvertibleSeriesEUnits
Preferred shares derivative liability	57,960	28,150
Significant Other Observable Inputs (Level 2) \| Recurring
Assets:
Interest rate cap agreement	14
Significant Unobservable Inputs (Level 3) \| Recurring
Liabilities:
Contingently convertible Series E units liability	72,057	66,938
Preferred shares derivative liability	$ 57,960	$ 28,150

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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