Goodwill (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Sep. 30, 2013	Sep. 30, 2012
Goodwill [Line Items]
Highest goodwill balance among other reporting units				$ 5,700,000
Average goodwill balance among other reporting units				800,000
Number of reporting units with allocated goodwill balances				208
Goodwill Carrying Value - UK Reporting Unit					6,900,000
Goodwill, impairment	0	6,946,000	1,550,000
Goodwill [Roll Forward]
Balance, beginning of period	179,249,000	179,423,000
Goodwill, Translation Adjustments	1,991,000	(174,000)
Balance, end of period	181,240,000	179,249,000	179,423,000
Accumulated goodwill impairment losses	(9,266,000)	(2,320,000)
Goodwill impairment	0	(6,946,000)	(1,550,000)
Accumulated goodwill impairment losses	(9,266,000)	(9,266,000)	(2,320,000)
Goodwill	$ 171,974,000	$ 169,983,000