Reporting Segments Reporting segment asset data (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Assets:
Total assets	$ 405,807	$ 400,705
GETS [Member]
Assets:
Total assets	130,269	142,428
PSS [Member]
Assets:
Total assets	168,786	150,795
MRI [Member]
Assets:
Total assets	28,098	29,044
Corporate [Member]
Assets:
Total assets	$ 78,654	$ 78,438