Share-Based Compensation - Valuation Techniques (Details) (Monte Carlo Simulation, Fair Value, Measurements, Recurring, Share Based Compensation Liability, USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014
Monte Carlo Simulation | Fair Value, Measurements, Recurring | Share Based Compensation Liability
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
OPP	$ 33,500
Expected volatility	34.00%