14. Segment Information Segment Asset Reconciliation (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 3,850,504	$ 3,709,718
Operating Segments [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	1,304,300	1,273,200
Other Current Assets [Member] | Segment Reconciling Items [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	980,300	926,900
Property, Plant and Equipment excluding segment specific [Member] | Segment Reconciling Items [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	81,600	46,100
Goodwill [Member] | Segment Reconciling Items [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	477,100	495,900
Other Noncurrent Assets [Member] | Segment Reconciling Items [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 1,007,200	$ 967,600