Taxes (Schedule of Gross Unrecognized Tax Benefits) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning Balance	$ 34,709	$ 31,789	$ 31,150	$ 8,798
Additions based on tax positions related to the current year		2,920	1,199	409
Additions for tax positions of prior years			688	21,943
Reductions as a result of lapses in the statute of limitations	0		(1,248)
Ending Balance		$ 34,709	$ 31,789	$ 31,150