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Income Taxes - Components of Net Income Before Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Components of net income before income taxes                      
Domestic                 $ 70,737us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic $ 63,278us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic $ 103,917us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic
Foreign                 (9,215)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign (1,759)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign (26,693)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign
Income before income taxes $ 16,715us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments [1] $ 10,064us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments [1] $ 17,741us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments [1] $ 17,002us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments [1] $ 12,482us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments [2] $ 16,631us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments [2] $ 18,862us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments [2] $ 13,544us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments [2] $ 61,522us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments $ 61,519us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments $ 77,224us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
[1] During the first, third, and fourth quarters of 2014 we incurred restructuring expenses of $1.2 million, $7.8 million, and $4.9 million, respectively, or $0.02, $0.12, and $0.11 per diluted share (see Note 6).
[2] During the first and fourth quarters of 2013 we incurred restructuring expenses of $0.9 and $11.5 million, respectively, or $0.03 and $0.25 per diluted share (see Note 6).