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Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2016

The following table presents the number of shares or units outstanding for each award type as of March 31, 2016 and December 31, 2015, respectively, (in thousands):



Award type	March 31, 2016	December 31, 2015
Stock options	829	829
Restricted stock units (time based)	1,752	1,915
Restricted stock units (performance based)	—	24
Stock appreciation rights	522	522
Market stock units	464	563

Market Stock Units Valuation Assumptions [Table Text Block]

The weighted average assumptions used to value the MSUs granted during the three months ended March 31, 2016 were as follows:



		March 31, 2016
Volatility		44.06%
Risk-free interest rate		1.04%
Expected option life in years		2.93
Dividend yield		—