Reporting Segments Reporting segment asset data (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Assets:
Total assets	$ 372,220	$ 405,807
GETS [Member]
Assets:
Total assets	120,223	130,269
PSS [Member]
Assets:
Total assets	159,774	168,786
MRI [Member]
Assets:
Total assets	23,539	28,098
Corporate [Member]
Assets:
Total assets	$ 68,684	$ 78,654