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15. Quarterly Financial Data (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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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, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 83,467 us-gaap_Revenues | $ 77,050 us-gaap_Revenues | $ 71,594 us-gaap_Revenues | $ 68,146 us-gaap_Revenues | $ 66,634 us-gaap_Revenues | $ 64,066 us-gaap_Revenues | $ 70,482 us-gaap_Revenues | $ 54,594 us-gaap_Revenues | $ 50,620 us-gaap_Revenues | $ 47,920 us-gaap_Revenues | $ 44,151 us-gaap_Revenues | $ 44,518 us-gaap_Revenues | $ 300,256 us-gaap_Revenues | $ 255,775 us-gaap_Revenues | $ 187,208 us-gaap_Revenues
Income before income tax expense | 14,346 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 13,804 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 12,329 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 11,764 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 11,540 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 10,559 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 8,546 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 6,528 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 4,607 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 2,728 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 1,341 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 512 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 52,242 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 37,173 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 9,187 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Net income | $ 8,010 us-gaap_NetIncomeLoss | $ 7,776 us-gaap_NetIncomeLoss | $ 7,026 us-gaap_NetIncomeLoss | $ 6,705 us-gaap_NetIncomeLoss | $ 6,522 us-gaap_NetIncomeLoss | $ 5,873 us-gaap_NetIncomeLoss | $ 4,825 us-gaap_NetIncomeLoss | $ 3,785 us-gaap_NetIncomeLoss | $ 64,828 us-gaap_NetIncomeLoss | $ 2,728 us-gaap_NetIncomeLoss | $ 1,341 us-gaap_NetIncomeLoss | $ 512 us-gaap_NetIncomeLoss | $ 29,516 us-gaap_NetIncomeLoss | $ 21,005 us-gaap_NetIncomeLoss | $ 69,408 us-gaap_NetIncomeLoss
Earnings per share - basic | $ 0.31 us-gaap_EarningsPerShareBasic | $ 0.31 us-gaap_EarningsPerShareBasic | $ 0.28 us-gaap_EarningsPerShareBasic | $ 0.28 us-gaap_EarningsPerShareBasic | $ 0.28 us-gaap_EarningsPerShareBasic | $ 0.27 us-gaap_EarningsPerShareBasic | $ 0.23 us-gaap_EarningsPerShareBasic | $ 0.19 us-gaap_EarningsPerShareBasic | $ 3.30 us-gaap_EarningsPerShareBasic | $ 0.14 us-gaap_EarningsPerShareBasic | $ 0.07 us-gaap_EarningsPerShareBasic | $ 0.03 us-gaap_EarningsPerShareBasic | $ 1.18 us-gaap_EarningsPerShareBasic | $ 0.98 us-gaap_EarningsPerShareBasic | $ 3.56 us-gaap_EarningsPerShareBasic
Earnings per share - diluted | $ 0.25 us-gaap_EarningsPerShareDiluted | $ 0.24 us-gaap_EarningsPerShareDiluted | $ 0.22 us-gaap_EarningsPerShareDiluted | $ 0.21 us-gaap_EarningsPerShareDiluted | $ 0.21 us-gaap_EarningsPerShareDiluted | $ 0.19 us-gaap_EarningsPerShareDiluted | $ 0.15 us-gaap_EarningsPerShareDiluted | $ 0.12 us-gaap_EarningsPerShareDiluted | $ 2.20 us-gaap_EarningsPerShareDiluted | $ 0.11 us-gaap_EarningsPerShareDiluted | $ 0.05 us-gaap_EarningsPerShareDiluted | $ 0.02 us-gaap_EarningsPerShareDiluted | $ 0.92 us-gaap_EarningsPerShareDiluted | $ 0.67 us-gaap_EarningsPerShareDiluted | $ 2.72 us-gaap_EarningsPerShareDiluted

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