Lease Obligations (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Operating Leased Assets [Line Items]
Lease expiration year, minimum			2015
Lease expiration year, maximum			2019
Percentage of increase in annual base rent, minimum	3.00%		3.00%
Percentage of increase in annual base rent, maximum	3.50%		3.50%
Lease exit costs	$ 218	$ 136	$ 441	$ 340
Rent expense, net sublease income	900	900	1,900	1,800
Adjustment for accretion and changes in lease assumptions	200	100	400	200
Rent expense	100	$ 200	200	$ 400
Deferred rent	$ 306		306		$ 327
Contract Termination
Operating Leased Assets [Line Items]
Lease exit costs			$ 1,900		$ 3,300