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Income Taxes, Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Summary of unrecognized income tax benefits |  |  |
Unrecognized tax benefits, beginning balance | $ 37,816 | $ 30,390 | $ 28,420
Additions for tax positions of current year | 7,382 | 7,610 | 6,388
Additions for tax positions of prior years | 1,783 | 883 | 1,858
Reduction for tax positions of prior years | (1,434) | (399) | (467)
Reductions for settlements of tax positions | (1,225) | (312) | (1,337)
Reductions for lapses in statutes of limitations | (5,448) | (356) | (4,472)
Unrecognized tax benefits, ending balance | 38,874 | 37,816 | 30,390
Effect of unrecognized tax benefit on income tax expense | $ 25,600 | $ 24,600 | $ 19,800

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- Definition Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Unrecognized Tax Benefit -URI http://asc.fasb.org/extlink&oid=6527854 + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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