Income Taxes (Details 5) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Unrecognized tax benefits
Balance, beginning of year	$ 4,029	$ 4,114	$ 954
Additions based on tax positions related to current year	1,292	276
Additions for tax positions of prior years	4,597	933	3,249
Reductions for tax positions of prior years	(401)	(764)	(89)
Lapse of statute of limitations		(530)
Balance, end of year	$ 9,517	$ 4,029	$ 4,114

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Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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