Income Taxes (Unrecognized Tax Benefits) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Unrecognized tax benefit netted against a deferred tax asset for a net operating loss carryforward	$ (7,133)		$ (8,422)
Document Period End Date	Mar. 31, 2014
Unrecognized tax benefits, period increase (decrease)	2,133	68
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning Balance	12,742	5,925	5,925
Additions for tax positions related to current year	263		6,546
Additions for tax positions of prior years	1,870		271
Reductions for tax position of prior years	0		0
Ending Balance	$ 14,875		$ 12,742