Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Income Tax Contingency [Line Items]
Effective tax rate	27.90%	21.40%	32.80%
Income taxes	$ 8,819	$ 4,199
2013 U.S Court Decision [Member]
Income Tax Contingency [Line Items]
Effective tax rate			17.50%
Income taxes			$ 16,428