Equity based compensation (Narrative) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	0 Months Ended	6 Months Ended	0 Months Ended
	Jun. 14, 2013	Jun. 30, 2013 Stock Option [Member]	Jun. 14, 2013 Executive [Member]	Jun. 14, 2013 Executive [Member] Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Loan receivable related party forgiven			$ 531
Shares exercised using loan		546,244		546,244
Incremental compensation expense related to the modification of loan	$ 508