Income Taxes Reconciliation of the beginning and ending amount of gross unrecognized tax benefits (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Current Income Tax Expense (Benefit)	$ 5,794	$ 6,381	$ 4,641
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning balance of gross unrecognized tax benefits	588	1,070	1,351
Additions based on tax provisions related to the current year	0	0	95
Reductions for the tax provisions of prior years	(53)	(164)	(11)
Reductions for settlement and payments	(323)	(318)	(118)
Reductions due to statute expiration	(127)	0	(247)
Ending balance of gross unrecognized tax benefits	$ 85	$ 588	$ 1,070