Schedule of Restricted Stock Units by Type (Details) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Total restricted stock units vesting conditions granted	3,098	3,151	3,553
Service-based restricted stock units
Restricted stock units vesting conditions granted	2,338	2,782	3,003
Performance-based restricted stock units
Restricted stock units granted with performance based vesting	760	369	550