Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified	1 Months Ended		3 Months Ended		6 Months Ended		12 Months Ended
	Nov. 30, 2013	Apr. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013 2013 U.S Court Decision [Member]
Loss Contingencies [Line Items]
IRS proposed adjustments to tax years 2000 through 2002, before penalty and interest		$ 16,500
Potential penalty, percentage of tax assessment		20.00%
Income taxes			11,557	23,218	20,375	27,417	16,428
Income tax examination, tax, penalties and interest expense	$ 12,700