Goodwill (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Sep. 30, 2015 USD ($)
Goodwill [Line Items]
Highest goodwill balance among other reporting units			$ 5,675
Average goodwill balance among other reporting units			$ 774
Number of reporting units with allocated goodwill balances			216
Goodwill [Roll Forward]
Balance, beginning of period	$ 183,190	$ 181,240
Acquired goodwill	1,149	3,907
Goodwill, Translation Adjustments	(2,312)	(1,957)
Balance, end of period	182,027	183,190
Accumulated goodwill impairment losses	(9,266)	(9,266)
Goodwill impairment	0	0
Accumulated goodwill impairment losses	(9,266)	(9,266)
Goodwill	$ 172,761	$ 173,924